Merino Short Sleeve Baselayer 1.0
A lightweight baselayer like the 100% Merino Short Sleeve helps control the moisture and temperature levels of your upper body. It is versatile enough to help keep you cool in summer and warm in winter conditions.
The comfort level of your ride is often in direct proportion to the effectiveness of your baselayer. With a Short Sleeve 100% Merino Baselayer, you will have the best natural material right next to your skin, wicking moisture away from your body during summer heat and winter chill. Merino also ensures the perfect level over insulation for cold rides. And you won’t have to worry about introducing your smelly presence into a coffee shop since the Merino offers an odor resistance to help you from alienating your neighbors at the next table.
Specification
- Constructed from 180g/m 100% Merino wool
- Soft to the touch
- Excellent moisture wicking properties
- Easy to care for with cold water washing
- Made in European Union
Features
- Multiple color options
- Slim performance fit
- Distinctive collar cut construction
Materials
- 100% Merino wool
Size Guide
Fit Guide
DIMENSION TABLE (cm)
| SIZE | XS | S | M | L | XL | XXL |
| A - BACK LENGTH | 66 – 68 | 68 – 70 | 70 – 72 | 72 – 74 | 74 – 76 | 76+ |
| B - CHEST | 84 | 84 – 88 | 88 – 94 | 94 – 100 | 100 – 106 | 106 – 114 |
DIMENSION TABLE (inch)
| SIZE | XS | S | M | L | XL | XXL |
| A - BACK LENGTH | 26 – 26,8 | 26,8 – 27,6 | 27,6 – 28,3 | 28,3 – 29,1 | 29,1 – 29,9 | 29,9+ |
| B - CHEST | 33 | 33 – 34,75 | 34,75 – 37 | 37 – 39,5 | 39,5 – 41,75 | 41,75 – 45 |
All our baselayers act like a second skin. Extremly slim fit cut with extended back side for lower back protection. Whatever Isadore jersey size you are used to wear, this baselayer will certainly fit you in the same size. However if you prefer more casual fit, we advice you to choose one size bigger than the Isadore jersey you are used to.
Not sure if you've chosen the right size?
Use our
Size Calculator
feature.
Product Reviews
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Submitted 8.5.2021
By Age MacKenzie
From United Kingdom
Base Layer Revelation
Apart from shorts I have never bought cycling specific kit. Too expensive and my size fluctuates too much. But at 55 years old in the UK weather I thought it was about time. WHAT a decision that proved to be. There is enough information on here regarding the technical aspects of this base layer. They are all correct and this base layer delivers in bucket loads. Warm in the cold weather, wicking and cooling in the hot. I am 180cm (6ft) and a slim long limbed physique with some youthful musculature remaining at 55 years old with a <100cm (<40inches). Large fits perfectly. Perfect. Quality superb. Comfy as. Couldn't be happier. Will be buying more stuff to go with this and the LS Jersey (large) I bought with which I was equally happy. Problem is this is such good quality it will last a long time and so my visits here won't be as frequent as Isadore would like.Show full review -
Submitted 21.12.2017
By Stefano Nucera
From Germany
A second skin
I'm using it in winter (under a jacket) and I used it in summer (below my Echelon Jersey) and it keeps perfectly the body temperature. And the cut is really comfy. Only your skin has the same body fit :)Show full review -
Submitted 22.12.2016
By Gary O'Sullivan
From Ireland
Can't Fault It
A superb piece of kit, standing up well to lots of use. I love the transferred on washing instructions. I find the fit great with arm length, torso length and head size all being just right. Doesn't ride up, doesn't develop smells and looks goodShow full review -
Submitted 3.12.2025
By Tamas
Perfect baselayer
The size and fit are just right. The model's measurements are also useful for choosing the right size. Merino wool performs well in a variety of weather conditions.Show full review -
Submitted 10.11.2025
By Tim
Comfort
Warm and breathableShow full review -
Submitted 8.11.2025
By Laurens
Good value for money
Ordered size small (and fit is good) but usually have large so do check the sizing chart. Good breathability, versatile (thanks to merino you can use it in different weather and temperature).Show full review -
Submitted 20.9.2025
By David Scheers
Excellent quality
Really like the quality and the soft feel of the merino shirt. Very comfortable. Size M fits perfectly (180cm, 72kg). Perfect additional layer for <10 degrees.Show full review -
Submitted 16.6.2025
By Jeff
This and arm warmers
This with some arm warmers would get you through cold days 5-10 degrees. Quite happy with it. Use it as a day to day base layer too lol.Show full review -
Submitted 20.5.2025
By Karel
Perfect
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Submitted 17.1.2025
By David
Top!
1A Qualität und Passform. Bei 1,82 cm und 80 kg liege ich genau zwischen den Größen. Habe mich für „M“ entschieden, da ich ja immer etwas drüber anhabe.Show full review -
Submitted 30.6.2024
By Jan Ledje
The perfect shirt for training and everyday wear
Merino wool is a great material to have close to the body when training. Have bought a number of merino wool sweaters from Isadore and am very satisfied with the quality and fit. Delivery and service work very wellShow full review -
Submitted 8.5.2024
By Hamid
super....
I bought this piece because I wanted a warmer layer underneath and it really helped. It fits quite tightly but due to its soft surface, it was really warm and comfortable to wear.Show full review -
Submitted 24.4.2024
By skip
pretty perfect
I wore this yesterday on a mixed road/gravel/woods ride, under a short sleeve jersey. I started with arm warmers that soon came off. While the temperature reached 20ºc in the sun it varied greatly depending on shade and speed, open road vs woods. I was able to modulate my comfort by zipping/unzipping the jersey, while the merino base layer never felt like too much. Like I said, it was pretty perfect.Show full review -
Submitted 26.2.2024
By Paul
great versatile wool T-shirt
I'm far from an Adonis, but this shirt has all the comfort of a soft T, with that amazing warm/cool you get from great merino. I've worn it for a workout ride as an underlayer, but also just out and about. It will be great as the season warms up, too. It's very breathable but makes for a great base--just the right amount of cling to make you feel more fit than you probably are. Four Stars from here as I'd prefer the collar not be notched, but it isn't a deal-breaker for such quality of wool and stitching.Show full review -
Submitted 12.2.2024
By Stephen
Fit, function and performance
As a fan of merino already I admit I’m biased. Just to add my penny or Euro to the mix. Large fits me perfectly. 178cm, 72kg. No race physique- well formed-wry smile. The feel for the grade of merino you utilise. How it fits me. Ideal for my riding ethos be it commuting or day long exploration- it just works. As many designer can attest, the best bits can of your endeavours often go unnoticed because they work so well, you don’t appreciate how well they work.Show full review -
Submitted 22.11.2023
By Sascha
Great baselayer for cold-ish days
Really love the baselayer. I usually wear size M (181cm, 70kg) and size M fits perfectly. It’s perfect for autumn/ early winter days. Really soft on the skin and perfect temperature/moisture management. Clear recommendation!Show full review -
Submitted 20.11.2023
By Juraj B
Comfortable Base Layer
Fantastic shipping - I purchased this base layer on Sunday and received the package in NYC on Tuesday. I purchased a size L (185 cm/ 85 kg) and it fits perfect. I love the fabric as it is really comfortable and soft. This is a versatile base layer that has worked for me so far in the early fall weather as well as in slightly colder temperatures in the morning. So far I’ve worn this with a light long sleeve thermal jersey and a the Debut wind jacket in temps from 6 C to 13 C and stayed comfortable throughout my rides.Show full review -
Submitted 25.10.2023
By John Bateman
perfect
A real pleasure to wear , will be back for more , in fact I'll get these and the long sleeve version. Isadore is oneof my favoritesShow full review -
Submitted 24.10.2023
By John Bateman
What you need
Excellent piece of kit, ideal for everyday , long rides , just what the doctor orderedShow full review -
Submitted 24.10.2023
By Daniel de Francisco Guisasola
From Spain
Premium Comfort
This base layer piece adapts perfectly to the body without feeling the pressure. The merino wool is the best fabric for these type of clothingShow full review -
Submitted 16.10.2023
By Cookie48
Supreme comfort and performance
Maybe a little biased but nature’s fabrics which evolve over time for good reason. Thus producing a piece of clothing or apparel from such fabric is likely to work. Use an appropriate yarn thread count with the right design and fit- it work seamlessly-pun intended. Especially practical on a bikepacking adventure. What more do you need?Show full review -
Submitted 9.10.2023
By Elmar
Perfekt
Good quality, size fits wellShow full review -
Submitted 7.9.2023
By Alexandre
Merino Base Layer
Every autumn I add a couple more of Isadore baselayers to my wardrobe. I use them for everything: running, cycling, weightlifting and even as "pijamas". Whenever I can't find one in my closet I know my girlfriend has stolen another one from me :)Show full review -
Submitted 22.8.2023
By Tomáš
Mohlo byt dlhšie
Hovorí sa že univerzálne ale na leto mi to prišlo teple tak uvidíme neskôr, veľkosť zatiaľ sedí ako pri iných produktoch, dufam že sa nezrazí aj keď mohlo byt o pár cm dlhšie vzadu.Show full review -
Submitted 23.5.2023
By Wafa Mari
Great piece to have
On your skin, nothing better to be in contact with your body more than merrino wool. Min oddor perfect for long rides nothing can make you comfy more than it under any top layer.Show full review -
Submitted 12.3.2022
By Age MacKenzie
From United Kingdom
The Best Base
OK, I have a complete wardrobe of Isadore kit. I love it all. I have put a reviews on the Signature Short Sleeved Jersey and Long Sleeved Jersey that included the base layer...but really...this needs to be shouted from the highest rooftops...YOU WILL NOT FIND A BETTER BASE LAYER ANYWHERE. "Does better than it says on the tin". Warm in the cold, cool in the heat. Comfortable. I now have several for my 'none cycling wardrobe' because these are stylish too with that collar detail. Do try one size up, but if you get it wrong then I have honestly never had an easier company to deal with. This was underscored when I ordered another base layer on Wednesday and it came on Friday! How did they do that? Oh, they wash well and dry quickly too.Show full review -
Submitted 18.1.2021
By Florian Fellner
From Germany
sizing
im around 78kg and 179cm tall. i compared M and L. Large is more comfy and looser. Medium fits really well, tight but still comfy. my built is muscular and i was afraid the medium would be tooo tight but its not. its just perfect. the material feels awesome, looks well made and the first ride in it was more then satisfiying. this will not be the last product of isadore.Show full review -
Submitted 19.5.2020
By Nathan Thomas
From United Kingdom
Comfortable and breathable
Had my 100% Merino SS baselayer for a couple of years now, and it still feels very soft and comfortable against the skin. Mine did shrink a little after a few washes even after following the care instructions, so in future I might be inclined to size up.Show full review -
Submitted 18.10.2019
By Miguel van den Wildenberg
From Netherlands
Top baselayer
My first Merino wool baselayer; I don't want anything else:) Following other reviews, I have ordered a size larger than normal. Size L is just perfect: 1.86m/72kg.Show full review -
Submitted 4.9.2018
By Pascal Gerritsen
From Netherlands
Excellent
I wear size L but next time i will try XL. I'm 1.93 and 78 kilo. Jersey is L but bas will be XL. Top quality, always wear Rapha, but this is much thicker and it fits better.Show full review -
Submitted 30.4.2018
By Christophe Verlinde
From Belgium
Light warm and breathable
Light enough to wear in warm weather, but warm enough also to be worn in rather chilly mornings. Very breathable and odorless if you do multiple day rides. I followed the advice to take a size bigger. Took size L, I'm 186cm and weight 73 kgShow full review -
Submitted 17.1.2018
By Mark Botham
From United Kingdom
Spot on
Had the l/s for a few years and it's been great. Don't know why but tried 2 other brands before going back to Isadore. It was the only one that fitted well, didn't itch and keeps me warm. You pay for quality.Show full review -
Submitted 22.8.2017
By Sascha Hartmann
From Germany
Simply Top
perfekte Passform - tight, long & stylisch ...Show full review -
Submitted 21.8.2017
By robert kalasek
From Austria
perfekt
hatte urspruenglich grau bestellt - "leider" gab es nur noch golden oak. seit dem ersten mal ausfahren bin ich ziemlich gluecklich mit golden oak. werde noch ein grau bestellen sobald es wieder verfuegbar ist. komfort, optik, gefuehl - alles passt. bezgl. groesse: wuerde im zweifel zur groesseren variante raten. mein SS in L ist sehr sehr knapp. XL passt ohne, dass irgendwo ewtas flattert - laut tabelle wuerde ich mit 190cm und 81kg ziemlich dazischen liegen.Show full review -
Submitted 1.2.2017
By Pierre Geronimo Corvaia
From Austria
Perfect baselayer
Short sleeve baselayer is thinner then the longsleeve baselayer. I am 175, 84 kg and wear an L. The baselayer is also longer then the longsleeve baselayer and covers more of your thighs. The quality is awesome after several times of washing it still looks as new - highly recommendable I just ordered a new one in greyShow full review -
Submitted 9.11.2016
By Martin Page
From United Kingdom
Excellent baselayer but watch the sizing...
Really nice material, quite thin but it seems to suit a wide range of temparatures. I like the design at the neck. I wear size medium in Isadore jerseys and shorts, and bought this baselayer in medium. It was a fairly snug fit, but after the first wash it shrunk slightly, and is now a bit on the tight side, and quite short at the waist. (I followed the washing instructions!) Having been so impressed with the quality of other Isadore garments I was a bit disappointed, but I will buy more baselayers in size large to allow for shrinkage...Show full review -
Submitted 22.8.2016
By Oliver
Very good quality, very tight fit
Well, if you know Merino, you know what it's worth. This piece is no exception. What you need to know, is that sizing is really tight. I usually wear L in all my shirts and trikots, which gives me a good fit. This baselayer is tighter than any other piece of wardrobe so far. I took XL, if I were to buy another one.Show full review -
Submitted 1.8.2016
By Dusan Samudovsky
From Slovakia
Athletic slim fit
Unboxing Isadore is like opening jewelry box. When trying on the tight fit is paramount for baselayer. This is tight at XXL for 193cm and 78kg with 96cm chest exhaled. XL is also good but I was afraid of possible shrinking after multiple washing and this is baselayer which is washed often, plus the extra cm to cover the back. I have the LONG SLEEVE JERSEY INDIGO BLUE in L (though XL would be very good fit as well) for reference and XL for bibs. It is a bit itchy for the first moment as almost all merinos but after a while I forget about it.Show full review -
Submitted 20.12.2015
By Rhett Butler
From France
Base layer not basic
If you are going to wear a base-layer it wants to be fabulous. These are, riding or socializing these are great, tight fitting so if you work out and want people to notice wear the base as a t-shirt and with the shaped collar it looks the dogs wotsits, on the road all day comfortable and keeps me warm and feeling dry. Top product !!!!Show full review -
Submitted 15.7.2015
By Philippe Lemmens
From Belgium
Stylish second skin
I have the short sleeve merino in black. This is like a second skin, so comfortable you don't feel you have this base-layer on. It evacuates sweat, so no uncomfortable feeling from this shirt when riding hard. It adds warmth without one feeling it, so good base-layer for intermediate temperatures (10-20° C.). Very stylish!Show full review -
Submitted 3.6.2015
By stephen pullman
From United Kingdom
A really good buy.
I have two of these vests and they wash well, dry quickly, do not shrink or stretch. They are comfortable through a wide temperature range and wick moisture well, they do not become itchy when damp. The vests are also good for wearing casually after a ride. Hopefully, Isadore will add a few more colours to the range.Show full review -
Submitted 29.4.2015
By Kevin Finch
From United Kingdom
Light, Comfort & Function
I have a few Isadore base layers now and I don't wear any other. The merino is soft and supremely comfortable. I always wear a base, even in summer (a vest), and these are excellent for wicking moisture away. They have no odour so you don't need to worry about the cafe stop. Wash them carefully (30 degrees maximum and use delicate cleaning agents) of course, and they stay like new.Show full review -
Submitted 17.5.2017
By Marian Kľúčovský
From Netherlands
great product
I used it for cycling and running during cold spring and it amazes me. It keeps me warm and dry even if sweating. It is also very comfortable and superbly cut. I am 191 cm, skinny but with wide shoulders and L size fits great.Show full review -
Submitted 21.12.2023
By Dmitry
Merino love
Excellent base layer. I find it very soft, not itching sensation. That may vary for some folks. Gotta love that Merino wool: excellent temperature, moisture and odor control.Show full review -
Submitted 13.4.2023
By Bohumil
Comfortable and functional
Quality for a great price (bought at a promotional discount). Excellent material. 183 cm, 78 kg - first S (I like the base layer tight) but it was short. Finally the XL was a good choice. Tight and long enough. Excellent communication and customer service. Fast and trouble-free exchange of goods. They even sent me a model from the new edition during the exchange.Show full review -
Submitted 22.5.2022
By Matúš
From Slovakia
velmi tesny
Objednal som veľkosť M, rovnako ako dres. Fit je ale menší a teda príliš tesný. Baselayer mi je vo výsledku celkom nepohodlný.Show full review -
Submitted 27.10.2019
By Uwe Flad
From Germany
Uwe
Teueres aber gutes Unterhemd aus 100% Merino. Die bestellte Grösse bei 178 cm und ca.76 kg war L. Dieses war viel zu klein und eng. Der Umtausch in XL war problemlos. In Verbindung mit dem Langarmtrikot von Isadore eine gute Lösung. Es kann bis zum waschen öfters getragen werden, Auslüften genügt, keine Geruchsentwicklung.Show full review -
Submitted 15.6.2019
By Felix
From Germany
Herr
Hatte das selbe Hemd schon in blaugrün. Trägt sich sehr angenehm. Körpernaher schnitt.Show full review -
Submitted 18.4.2019
By Christophe LE GONIDEC
From France
VERY GOOD PRODUCT, BAD CUT...
I'm very happy with Isadore signature jerseys! Size S fits perfect for me. So I decided to order 2 baselayers size S(one SL and one SS). They were suprisingly too small for me ; I had the impression to wear my child clothes! I exchange both for Medium size as Isadore Return and Exchange works very well. SL baselayer fits perfect but SS one remains too short in M and therefore very uncomfortable. Anyway, I'm happy with the first one. I wear it as often as I can. Nevertheless, I have to admit that I hesitate to order other Isadore articles because of this size/cut issue.Show full review -
Submitted 31.3.2019
By Stephan
Nice cut and comfortable to wear
Very good and warm baselayer! A little bit short for me, but helps perfect during winter and spring.Show full review -
Submitted 11.1.2019
By Matúš Hübler
From Slovakia
Výborne
Nátelnik s výbornými termoregulačnými vlastnosťami vhodný aj na iné outdoorové aktivity, ako je cyklistika. Pri kúpe odporúčam vybrať o číslo väčší nátelník, vzhľadom na to, že je vyrobený z vlny a po vypratí má tendenciu sa zrážať. Prať len ručne!Show full review -
Submitted 26.10.2018
By Ulrich Ziegler
From Germany
Herr
Sehr eng anliegendes U.-Hemd, sehr knapp bei Gr. M/175cm/70kg, Evtl. minimal zu kurz geratener Rumpf, aber ich persönlich finde es super. Größe M der britischen Konkurrenz (R.) ist mir etwas zu lang, drauf sitzen mag ich nicht.. Also tendenziell eine Nummer größer, wenn man das racemäßige nicht so mag...Show full review -
Submitted 17.10.2018
By Tomáš
From Slovakia
Comfy baselayer, great features
Probably the best baselayer I've ever had. Nice and soft, no skin irritation :)Show full review -
Submitted 2.9.2018
By Lukas
From Slovakia
Tight and comfortable
This merino baselayer is absolutely great. Worth of the money.Show full review -
Submitted 31.8.2018
By Robert Mitosinka
From Slovakia
Mr
Super kvalita aj farba. Velkosti su trochu nevyspytatelne medzi dlhym a kratkym rukavom ... M a M nie je celkom totozne.Show full review -
Submitted 12.8.2018
By Florian Possinger
From United Kingdom
Mr.
I used to buy my merion baselayer from another carrier. But now that I know the Isadore quality I'll always get them here. They fit tightly and keep me warm on cold morning rides. They don't get hot when the temperatures rise. Perfect.Show full review -
Submitted 26.7.2018
By Vladimir Houdek
GOOD bUT NOT BEST
The best off :)Show full review -
Submitted 19.6.2018
By Paul Renson
From France
Perfect
The base layer looks great and fits very well. Keeps the body at a comfortable temperature even for long and difficult rides.Show full review -
Submitted 4.4.2016
By Ulf
From Germany
Merino rocks!
Very nice base layer, that works excellent for longer rides in northern european weather - you'll stay warm in the morning and when the sun gets warmer the merino will cool your body - magic!Show full review -
Submitted 12.1.2026
By Holger
Another great product made worse?
I bought version 1 of this T-Shirt years ago, and it still easily is one of the best Merino products I have ever owned. After years of constant use and washing until today there is not a single hole in both shirts I bought - unlike all other Merino brands. About a year ago I bought version 2 of this shirt, and instantly had the feeling that it was considerably thinner than the previous version. Just as I had bought another two of these shirts some weeks ago, a first hole appeard in my first version 2 T-shirt, whereas the older version 1 ones are still fine. And the latest shirts feel even thinner. Also, the new version now has Elasthan in it, while - if I remember correctly - the old version was 100% Merino wool. I don't see any reason why there needs to be Elasthan in the shirt as Merino wool is naturally elastic. In my opinion the only reason is to have some more stable plastic thread in order to use less wool. All in all I have the feeling that the thickness of the fabric - and for Merino wool that's quality - has considerably worsened. Also, I can't understand other comments about the sizing with statements that size M fits guys with 180cm and with 70 or even 80kg well. I am 173cm and 85Kg; normally, I wear size M in T-Shirts. Alright, for bike brands it's L. But for Isadore it's XL. The version 1 of the T-Shirt at least was very long, so it was clear that it would fit thin and tall guys. But the current version XL looks exactly like everyday brands size M... Having said all this, the look and fit (once I found the correct size) is perfect. I just doubt durability.Show full review -
Submitted 6.9.2023
By Georg Resch
Gute Qualität doch leider zu kurz
Der Wollstoff ist von hoher Qualität (dünn, gute Dehnbarkeit und doch abriebfest) doch für meine Größe (193 cm) ist selbst die größte Größe zu kurz. Ich habe selbst 10 cm unten dran genäht. Dann ist es gut.Show full review -
Submitted 16.12.2020
By Andrew Rudczynski
From United States
Too short in the waist
This baselayer is nice and warm. However, importantly for the recommended size it is too short in the waist. As a result the waist is exposed to the cold as the baselayer rides up during exercise. the baselayer should be at least 4 inches longer so that it stays tucked in.Show full review -
Submitted 8.2.2017
By Nick Wang
From Taiwan
Looks good but the durability is poor
it's a race cut fit, that holds body well. however, i do not like it got wrinkled, side seams were twisted and a small hole on chest near decoration after the first wash. i always throw my cycling kits into laudry bag. it's kind of disapointed though.Show full review -
Submitted 16.4.2016
By Jeffrey Bell
From Australia
Great but a question of durability.
A really excellent baselayer, warm and effective on brisk Melbourne mornings, great fit as well. Only problem is after first wash got a number of holes in random locations, washed on light setting, top loader as per directions with a wool & delicate detergent along with similar cycling delicates..Show full review
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