Merino Long Sleeve Baselayer
When the riding weather turns decidedly chilly, it’s time to break out the 100% Merino Long Sleeve Baselayer. Slightly thicker than the SS and SL versions, this is a base that can be paired with one of our Long Sleeve Jerseys to keep you warm well into the worst of winter.
The comfort level of your ride is often in direct proportion to the effectiveness of your baselayer. With a Long Sleeve 100% Merino Baselayer, you will have the best natural material right next to your skin, wicking moisture away from your body to help keep off the winter chill. With a refined, updated fit, the Merino Baselayer 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.
Temperature 8°C to 16°C
Weight 4/6
Breathability 5/6
Wind protection 2/6
Specification
- Constructed from 250 g/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
Product Reviews
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Submitted 11.10.2024
By a
Great, warm
Almost too warm! Very snug and comfortableShow full review -
Submitted 11.12.2023
By Brent
Merino Long Sleeve Baselayer
The jersey is a nice winter weight. It is form-fitting and comfortable against the skin. It seems to wick pretty well. Certainly a good add to my cycling kit.Show full review -
Submitted 21.12.2025
By Ivana Tomac Vukosav
From Croatia
Very great baselayer
the best base layer I've had so far....warm and breathable....and odourless.... even with temperatures cca -2, ride it paired with Deep Winter Jersey, did the job..., using it as off the bike regularly for other activities....Show full review -
Submitted 26.10.2025
By Dominik Granačka
From Slovakia
Fantastic merino baselayer
I'm 180cm/64kg size XS and its something that you MUST have in cold winter rides ,it could be little longer in the waist but anyway it fits me well .Show full review -
Submitted 26.10.2025
By Dominik Granačka
From Slovakia
Fantastic merino baselayer
I'm 180cm/64kg size XS and its something that you MUST have in cold winter rides ,it could be little longer in the waist but anyway it fits me well .Show full review -
Submitted 9.7.2025
By Martin Page
From United Kingdom
Very versatile and comfortable
Really nice quality base layer, suits a wide range of temperatures, especially by varying the outer layer. Slightly thicker material than the short-sleeved merino base layers. I am normally a medium in Isadore tops, but I go for size large in merino baselayers and they fit well. Definitely recommended.Show full review -
Submitted 16.4.2025
By Chris
incredibly comfortable and warm
this baselayer is perfect for cold mornings, fits perfectly (size S, I'm 176cm & 65kg) and feels like a second skin! this is the first thing I reach for later winter/early spring rides.Show full review -
Submitted 16.2.2025
By Josip
From Croatia
Superb
I'm 187 cm, 90 kg, on the thicker side. I ordered this base lyer in size XL and it fits perfectly. It's soft on the skin, no problems with the length of sleeves and my belly has a space for growing even bigger during longer rides with many pit stops :) Managed to catch one 50 km ride in it so far. Temperature ranged between 1-2 degrees Celsius with chilly wind (headwind in all directions, of course). Wore only this base layer under the Perffeto RoS 2 jacket and I was still very warm and even got quite a bit sweaty. Amazing item. Recommended.Show full review -
Submitted 17.1.2025
By Francisco Suarez
Perfecta y polivalente
El título ya lo dice todo, el tacto es muy agradable, es cálida pero no agobia, muy transpirable, se ajusta perfectamente al cuerpo sin agobiar y no se retuerce, variedad colores bonitos que facilitan la combinación con cualquier prenda.Show full review -
Submitted 17.1.2025
By David
Top!
Super Qualität… habe bei 1,82 und 80 kg die Größe „L“ bestellt. Die Ärmel sind etwas lang aber okay!Show full review -
Submitted 31.10.2024
By Dušan Augustiňák
From Czech Republic
Merino
Super střih, perfektně sedí, příjemný materiál - 190 a velikost L. ????Show full review -
Submitted 1.10.2024
By Richard
Fantastic Merino - truly a quality product
I couldn't believe how nice this base layer is to wear. Apart from the incredible comfort, it is wonderfully warm and more than enough under the Alternative Eco-Fleece long sleeve with a light gilet on top, even down into the low single digits. I can't wait to test this in the properly cold depths of the Norwegian winter.Show full review -
Submitted 21.3.2024
By Daniel Jaber
From United States
Merino is Winter's Friend
Exactly what you would expect from Isadore! Great fit and construction, but more importantly superior quality. Excellent warmth and LUX merino wool. Excellent deep wine base. I wear this great piece skiing and riding and anything else I can use it for. Highly recommend.Show full review -
Submitted 3.3.2024
By Simon
Excellent quality and function
I have several of these, which I have bought over the last few years, this and they are excellent, the provide warmth on cold days and do not leave you feeling like you are soaked when you increase the effort. Great range of colors easy to care for. Would buy again.Show full review -
Submitted 31.1.2024
By Alex K
Comfy, warm and HQ
I recently received it in the mail. You can see quality present in the product and the compostable packaging. Wore it, with a light jersey and a vest on this morning when the outside temperature was 12 C. Perfect combination as I didn't feel cold and didn't overheat.Show full review -
Submitted 15.1.2024
By Veronika
Veľmi pohodlné
Skvelé merino, kúpili sme aj pánske aj dámske. Je priliehavé, takže nikde neprefukuje, po vysokej záťaži a vyvetraní vôbec necítiť pot, je hrubé, ale pri spotení je omnoho menej mokré ako klasické termotričko. Je trošku kratšie ako sme zvyknutí, ale zase nikde nezavadzia a úplne to stačí. Za nás skvelý produkt.Show full review -
Submitted 30.12.2023
By Ernesto M.
Great, just great.
Perfect fit. Warm, soft, tight. It is my favorite base layer.Show full review -
Submitted 28.12.2023
By Amedeo Pierasco
From Italy
Ottima
As I imagined, excellent merino wool sweater. I am 180cm tall and weigh 75kg. I bought the size L and it is perfect, the only thing is the slightly long sleeves.Show full review -
Submitted 21.11.2023
By Marek Varga
10/10, extremely good
Absolutel great baselayer, keeps warm during morning rides at 4-10 degrees C with just a hoodie on. Great to use off the bike as well under the jacket etc.Show full review -
Submitted 27.10.2023
By Takumi Kawahara
From Japan
素晴らしい
旧作を使っていたが、新しい方を購入した。 とても良い。Show full review -
Submitted 16.10.2023
By Marcel
Lovely warm base layer
Certainly a great buy! Warm and comfortable on cold rides and on the ski slopes. Nice long sleeves; only improvement I can think of is a slightly longer body to tuck in.Show full review -
Submitted 3.4.2023
By JD
Big fan!
A little warmth on the chilly mornings helps with getting outside and into the saddle. Feels good against the skin.Show full review -
Submitted 7.3.2023
By Eric
Great on the bike and off the bike
Lightweight and hot enough for being the sole layer under a Jacket for a deep winter ride in Flander. Love it on the bike and off the bike too.Show full review -
Submitted 6.3.2022
By Daniel Crabbe
From United Kingdom
Fragile!
Nice for the first season but after a few uses in the second several holes appeared around the arms. I got size M, normally and S with the brands (rapha).Show full review -
Submitted 4.1.2022
By Roger Murer
From Switzerland
Too short
I am 78kg, 188cm with a chest of 100cm. I purchased in XL however arms and body are too short. However this Meriono-Shirt keeps you warm even when it is wet.Show full review -
Submitted 26.11.2021
By Eduard Winkler
From Slovakia
Great product
I'm enjoying wearing it even when I'm not going on bike. It's very confy and warm. On a bike is working well in cold, used only once, but was very happy with this product.Show full review -
Submitted 21.11.2021
By Melih Aslan
From United States
Too scratchy for a hairy chest
I liked the product however I have a hairy chest and it was really scratchy for me to use it. I had to return it.Show full review -
Submitted 14.6.2021
By David Geczy
From Slovakia
Skvelé Merino
Nemal som zatiaľ až toľko skúseností s merinom, ale toto je naozaj vynikajúce. Vôbec, ale vôbec neškriabe, naopak je veľmi príjemné na telo. Ani neviem, že to mám. Vôbec nesmrdí po niekoľko-násobnom použití čo je super. Jediný problém menší, ktorý som našiel je, že by bolo dobré spraviť dlhšie rukávy resp. ich vyriešiť nejako inak.Show full review -
Submitted 14.3.2021
By Florian Fellner
From Germany
size it one up :)
get one size bigger then your usual isadore product. its quiet short on the arms (im not a long arm guy, really just regualr). im 179cm and around 77kg. i usual have Medium (the regular tshirt baselayer fits perfect on me) but the long one was just to tight in armpits and to short on the arms. the merino wool feels awesome.Show full review -
Submitted 12.12.2020
By Tomi
THE BEST - ALL AROUND LAYER WITH 100% MERINO
I am 182 and 74kg, ordered M (I have everything in M from Isadore) and it comes Race fit. (if you want more relaxed, then go one size up). I use it for Hiking and Winter climbing as well. This is such a quality product from Merino, the best I have ever seen or used (I have a lot of them). Soft on touch and really warm and thick. The price is a steal, go for it!Show full review -
Submitted 30.11.2020
By Roger Murer
From Switzerland
Roger
Great baselayer! I am 188, 77kg, chest 100cm with long arms. Size L works, but arms could be 2-3cm longer.Show full review -
Submitted 3.8.2020
By Grant Reaburn
From New Zealand
Superb
I have a drawer full of merino thermals I wear both off and on the bike. Most are 150 or 180gram weight. This one is 250gram and is the best by far. The sizing is tight to begin with but merino does loosen up with time. Some have commented that these are expensive. I disagree. If you can find a 250gram merino top at a better price I would be surprised and of this quality definitely not. Chapeau Isadore!Show full review -
Submitted 19.5.2020
By Nathan Thomas
From United Kingdom
Comfortable and breathable
Had my 100% Merino LS 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. The Maritime Blue colour is definitely closer to the blue in the model photos, rather than the more purplish tone in the product image, but it's still a great colour.Show full review -
Submitted 5.4.2020
By Sebastian Geis
From Germany
Laurel
Hello, The wearing comfort is really great. However, after a few washes, the seams have come loose, so that the foldover of the shirt has dissolved in the lower area.Show full review -
Submitted 29.1.2020
By Bernd Konow
From Germany
Bernd
Eins der besten Kleidungsstücke im Laufe meiner Radsport-Ära. Tolles Material, jeden Cent wert. Ich liebe es.Show full review -
Submitted 26.1.2020
By Daniel Pápež
From Slovakia
Lepšie na zimu som nemal
super kvalita ,len rukávy sú krátke a trocha veľký výstrih okolo krkuShow full review -
Submitted 16.1.2020
By Daniel
From Slovakia
Kvalitne ale strih katastrofa
Aky expert sije tie merino natelniky? Kupil som si L ale mam ho ako damsky crop, rukavy su vytahane.. material je super ale to prevedenie ma sklamalo.Show full review -
Submitted 12.1.2020
By Milan Hulman
From Slovakia
super
Možem len odporučiť super materiál.Len to logo na predku po prvom praní hneď bolo fuč..treba dať lepšie Ale inač len chválimShow full review -
Submitted 18.11.2019
By Jan Habětín
From Czech Republic
Comfort long sleewe baselayer
Nice soft warm merino fabric which does not smell. I chose size L because of lenght. 182cm, 73kg, 97cm chest and it fits good as well. Normally I wear size M (Merino long sleewe jersey).Show full review -
Submitted 18.10.2019
By Miguel van den Wildenberg
From Netherlands
Very nice
For a 'winter' baselayer I would preferred a higher collar, but is still a very fine shirt. Following other reviews I have ordered a size bigger than normal. Size L is just perfect for me: 1.86m/72kg.Show full review -
Submitted 8.2.2019
By Ignacio Prieto Diaz
From France
Nice baselayer
I love the soft feeling of this perfect baselayer. The holes for the thumb are nice keep the sleves on the place but, at least for me, they are not useful during the ride. Perfect temperature keeping, and as promise no smells after using! 185 cm / 84 kg size XL good fitting.Show full review -
Submitted 9.1.2019
By George Charalambides
From United States
Very good material and packaging, fit is a problem.
Too short to the point of not being practical, and neck opening too large, and arms too short. it's a shame because otherwise the color, material, construction, and remaining cut is perfect for a cyclists' body.Show full review -
Submitted 7.1.2019
By Kris Terauds
From Switzerland
Comfortable and form fitting for colder rides
I wear several non-cycling merino shirts as base layers. This one is better: softer on the skin and form fitting. It is also thicker than the others, so I wear it on my coldest rides. I am 193cm/95kg and the XXL fits me perfectly.Show full review -
Submitted 4.1.2019
By Juraj Toth
From Slovakia
Great base layer
One of best base layers. Material is awesome and it is also looks really nice. Some of the stitches are not that great so -1 star for that but overall really great product.Show full review -
Submitted 21.12.2018
By Stefan Zieg
From Germany
Comfortable but sleeves too short
Just bought XXL (180/90) for Winter walks and rides, feels very comfortable und cosy. Unfortunately the sleeves are about 2-5 cm to short. Usually this is not a problem for me with other brands and the Ovada Deep Winter Baselayer Men in XL. Using the thumbholes helps a littlelittle bit. Please give some cms to the sleeves ;-), especially for winter.Show full review -
Submitted 13.11.2018
By Andras Balazs
From Hungary
great stuff
Beutifully packaged ,real luxurious feel. Fast wicking,really comfy.Only one thing,it could be a little longer in the waist.Show full review -
Submitted 31.10.2018
By Miloš Gregorka
From Slovakia
Výborná základná vrstva
Výborná základná vrstva. Skutočne nehryzie nezapácha a vytvára ohromný pocit komfortu.Show full review -
Submitted 31.8.2018
By Robert Mitosinka
From Slovakia
Mr
Super ale kratke rukavy sa miz daju kvalitnejsie. Velkosti su trochu nevyspytatelne medzi dlhym a kratkym rukavom ... M a M nie je celkom totozne.Show full review -
Submitted 9.6.2018
By Philippe Lemmens
From Belgium
High quality merino
I purchased a few of these long sleeve merino base layers. It's a high quality merino, which allows for some flexibility in temperature to stay comfortable (not too hot or cold), so I use this base layer when temperatures differ much between the start and finish of my ride. It's also very nice to have a beautiful blue instead of black or white. I'm 1.75 m and 71 kg, and purchased Large (which is a very comfortable fit, and still close to the body - Medium should be my size, but I prefer a larger fit for winter and have longish arms). As I have a number of these already, needless to say that I'm very happy with this great base layer.Show full review -
Submitted 20.2.2018
By Vaughan Watson
From United Kingdom
GOOD ADVICE
Great base layer pair this with long sleeve jersey and Merino Softshell Jacket still warm in sub-zero conditions. Love the thumb holes nice touch. The advice is to buy a size bigger than your jersey size - i can definitely recommend this as even when using cool hand wash the item did shrink a little which is fine if you buy a size up. Highly recommended as usual with the brilliant Isadore gear!Show full review -
Submitted 13.2.2018
By Mulotti Emmanuel
From France
Chaud
Sous couche qui fait bien le job. Température négative en ce moment , je le mets avec la veste Softshell Marsala et je n'ai pas froid. Très agréable à porter , doux et aucune couture qui gêne . Pris en taille L 1.81cm 70 kgShow full review -
Submitted 9.2.2018
By Matthieu Bardou
From France
Au chaud tout le temps !
J'utilise ces baselayers pour courir ou pour les sorties à velo et j'en suis vraiment content. Ils sont parfaitement coupés et leur technicité en fait un allié précieux pour rester au chaud et au sec. Je les recommande fortement +++Show full review -
Submitted 23.12.2017
By Ian Bowden
From United Kingdom
Best baselayer I have owned
I have been really impressed with this base layer. It is a great fit, and super warm so far. I have been riding in 1 - 10 degrees and the base layer and a Gabba jersey have been a perfect combination. I really like the quality of the base layer and hope it last longer than my previous merino layer, from another leading brand, which disintegrated after a couple of years. Cstomer service and packaging are a joy also.Show full review -
Submitted 2.12.2017
By Mulotti Emmanuel
From France
Parfait
J'ai choisi ce maillot en noir , taille L (1.81m 71 kg) Il est très agréable a porter , ni trop chaud ni trop froid. On oublie même qu'on le porte. Essayé ce matin , température de 2 degrés avec une veste hiver par dessus , parfait . Le petit truc en plus , une ouverture en bout de manches pour passer le pouce et éviter que la manche remonte.Show full review -
Submitted 28.10.2017
By Markus Bee
From Germany
Markus B.
Ich hatte noch kein Unterhemd, welches sich so angenehm angefühlt hat. Super sind beim langärmeligen auch die Daumenschlaufen. Der Baselayer schmiegt sich eng an den Körper und reguliert hervorragend Wärme und Feuchtigkeit. Obwohl ich die Trikots alle in M habe (187/74) passen mir die Baselayer in Größe L besser.Show full review -
Submitted 29.9.2017
By Guido Bollenbach
From Germany
Guido
Great Baseler. Warm and soft. What else should be there.......city rides to work or training....prepared against the coldShow full review -
Submitted 21.8.2017
By robert kalasek
From Austria
passt
perfekt ! - mit potenzial auch bei mir zum lieblingsstueck zu werden ! mit drei kleinen einschraenkungen: - die daumenschlaufen sind nicht mein ding ... dort zieht es rein - die armel sind an den handgelenken etwas weit (in kombi mit den schlaufen - zugluft) - xl passt perfekt - allerdings ist die laenge ist etwas knapp bemessen fuer ein rad-baselayer-teil. hinweis. laut groessentabelle wuerde ich zwischen L und XL liegen ... habe das SS in L und das ist ziemlich knapp. daher auch meine empfehlung eher groesser waehlen. 190, 81kgShow full review -
Submitted 14.7.2017
By Luca
From Germany
True Merino experience
Quality Merino under vest, feels soft and dry all the time. Great fit and outstanding design, i actually ended up using it in colder days also while working.Show full review -
Submitted 7.2.2017
By Jens Heinen
So geht's!
Wieder volle Punktzahl für ein Isadore-Produkt: Sehr gute Passform, die Ärmel mit Daumenschlaufen haben die richtige Länge, sehr angenehm zu tragen, tolle Isolation, behält beim Waschen die Form, langlebig. Dazu lässig designed und nachhaltig hergestellt. So geht's.Show full review -
Submitted 10.1.2017
From
Schlichtweg das Beste!!!
Aufgrund der positiven Rezesionen hier habe ich mir dieses Unterhemd bestellt! Vom ersten mal Anziehen war ich schlichtweg begeistert! Tolles kuscheliges Tragegefühl und eine gut sitzende anschmiegsame Passform. Fahre bis -5 Grad 3-5 Stunden mit diesem Baselayer und der Isadore Jacke. Kalt wird es nicht! Der Schweiss wird fantastisch abtransportiert und das Körperklima wird durch Merino super reguliert! Verwende es mittlerweile auch zum Joggen, wandern und im normalen Alltag!! Ein absolutes musthave und mein Lieblingskleidungsstück! Wunderbar dass es auch in Europa zu (hoffentlich) gerechten Lohnverhältnissen gefertigt wird. Abgesehen von der Fertigung ist das Leiberl noch in einer anderen Hinsicht nachhaltig: Man braucht es nur alle 3 Wochen waschen! ! Fängt nicht zu riechen an! ! Wirklich ein tolles Produkt! Outstanding!! Ich: Rennradfahrer 10.0000 KM pA // 180 cm/ 82 kg = Large anliegend = Xlarge lockerShow full review -
Submitted 26.10.2016
By Markus Mehlig
From Germany
Herr
Very comfortable, no smell even after harder rides! Best base layer I've ever worn. Absolutely worth the price!Show full review -
Submitted 25.9.2016
By Matthäus Grabner
From Austria
Herr
Sehr angenehm zu tragen, schöne Verarbeitung. Wer es ebenso für den tagtäglichen Gebrauch nimmt, sollte es ev. eine Nummer größer nehmen. So habe ich es nach der Kaufberatung gemacht - passt perfekt.Show full review -
Submitted 31.3.2016
By Ed Newey
From Switzerland
Best base layer you will ever use!
This is a bold statement I know, however its absolutely true. These base layers are outstanding and have become my number one item for every ride, ski, walk and generally anything outside! Super soft, they wick moisture away from the skin immediately, they don't leave a bad smell and wash very easily. I have been washing them a lot and after 5/6 months they are still in great condition. They are probably the most popular item in our cycling club. Buy the bundle and then 3 of each because you will use them and your friends will want some too! Another outstanding product from Isadore.Show full review -
Submitted 17.3.2016
By stefan
Stefan Ziegenhagen, Cologne Germany
checked a lot of base layers, no doubt this one is the best I've ever wornShow full review -
Submitted 10.3.2016
By Mark Botham
From United Kingdom
Quality
Ordered this as my UnderArmour made me feel the chill when it was around 5 degrees. So having seen this get top marks in a cycling magazine I thought paying a bit for a better quality product was the way to go. Simply, it is very comfortable & keeps the chill completely off. Much better than the UnderArmour. I know price is always a consideration, but you pay for quality. I cant recommend this highly enough.Show full review -
Submitted 21.2.2016
By Thomas Bierbaum
From Germany
Thomas Bierbaum
Dieses Unterhemd ist sehr angenehm warm und weich, es hält den Körper warm und trocken, habe es jetzt im Winter als Baselayer bei kaltem, feuchtem und sehr windigem Wetter getragen und mich immer pudelwohl gefühlt. Sehr praktisch sind auch die Daumenschlaufen an den Enden der Ärmeln, beim Drüberziehen der nächsten Schicht und zum Abdichten am Handgelenk. Dieses Unterhemd ist so angenehm, ich trage es nicht nur beim Sport... Klare Kaufempfehlung.Show full review -
Submitted 24.10.2015
By Barry Fink
From United Kingdom
The quality and feel of this is amazing, purchased it in the grey and it looks very stylish,keeps you warm yet still doesn't leave you sweaty. if this is the quality of the base layer then I can't wait to get my hands on the soft shell jacket, will allways be buying isadore gear from now on. Also love love the personal touch and the packaging, all in all great products and great companyShow full review -
Submitted 5.10.2015
By TIM STRANG
From United Kingdom
Very nice style and fabric and good quality. Unfortunately, even though I followed the washing instructions, it has shrunk a little and I wish I had bought a bigger size.Show full review -
Submitted 18.5.2015
By jose manuel zamora venero
From Ukraine
esto si es segunda piel
acertado, 100% recomendable, en isadore gasto la xl, en esta prenda tenia que haber elegido la xxl,me queda un pelín justa(para que lo tengáis en cuenta pero lo use y... de todos modos , muy a gusto.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
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