Merino Sleeveless Baselayer
Universal baselayer with a high content of the finest merino wool with added elastane.
Merino wool is exceptionally soft to the touch, has thermoregulating properties and thanks to its unique features it keeps you warm even after sweating. Elastane increases the material’s shape retention and its ability to adapt to the human body. Treated with TEC (Total Easy Care) treatment, which ensures that the fabric is suitable for frequent washing without losing its original shape or wrinkling. Complete with an improved type of flat seam that enhances the second-skin feel.
4 way stretch
Moisture wicking
Breathable
Lightweight
Thermal regulation
Antibacterial
Quick drying
Flat seams
Merino wool
Specification
- Made of 150 g/m2 merino wool
- Soft to the touch
- Made in the EU
Features
- Raglan sleeve
- Flat seams
- The highest level of softness with a fiber thickness of 16.5 microns.
Materials
- 95% Merino Wool
- 5% Elastane
Merino wool
Size Guide
Fit Guide
| MEASUREMENT | XXS | XS | S | M | L | XL | XXL | 3XL |
| A – Chest | < 85 | 85-91 | 91-97 | 97-103 | 103-109 | 109-115 | 115-121 | 121-127 |
| B – Waist | < 73 | 73-79 | 79-85 | 85-91 | 91-97 | 97-103 | 103-109 | 109-115 |
| C – Hip | < 88 | 88-94 | 94-100 | 100-106 | 106-112 | 112-118 | 118-124 | 124-130 |
| D – Arm length | < 72 | 72-74 | 74-76 | 76-78 | 78-80 | 80-82 | 82-84 | 82-84 |
| E – Inseam length | < 76 | 76-78 | 78-80 | 80-82 | 82-84 | 84-86 | 86-88 | 86-88 |
Chest – circumference measured in widest place
Waist – circumference measured in narrowest place
Hip – circumference measured in widest place
Arm length – measured from neck line to wrist
Inseam length – measured from crotch to ankle
Please note that given measurements apply to average body proportions. When chosing a size, please consider specifics of your own body.
| Weight / Height | 159-164 cm | 165-170 cm | 171-176 cm | 177-182 cm | 183-188 cm | 189-194 cm | 195+ cm |
| W 60-66 kg | XS | XS | XS | XS | XS | – | – |
| W 67-72 kg | XS | XS | S | S | XS | – | – |
| W 73-79 kg | – | – | M | M | S | M | – |
| W 80-88 kg | – | – | XL | L | M | M | L |
| W 89-98 kg | – | – | XL | XL | L | L | XL |
| W 99+ kg | – | – | – | 3XL | XXL | XXL | 3XL |
Low to Medium Compression
A relaxed fit, allowing for full freedom of movement without compromising on performance. Designed for every day rides, where comfort is key.
Product Reviews
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Submitted 30.4.2026
By Martino
Great fit
Great fit, great Quality. Drys quick and doesn‘t smell even when you wear it for some days on a tour.Show full review -
Submitted 13.4.2026
By Yves Leduc
Perfect for cooler days
Merino baselayer is perfect for Spring rides. Very soft and stretchy fabric that feels like you didn't have it on, except for the added warmth that feels really nice this time of year.Show full review -
Submitted 25.11.2025
By Peter
too small
feels nice on the skin but XS is too short for 185cm 65kg. I reorder a M size.Show full review -
Submitted 7.2.2026
By Alex
Great baselayer
Really comfortable material, sits well underneath my kit and feels good againsy my skin when i'm out on a ride.Show full review -
Submitted 28.10.2025
By Stefano
Perfect base layer for autumn/spring
Amazing base layer, keeps your body warm & dry. Used in combination with a normal jersey on rides with 13-15°C and it was perfect.Show full review -
Submitted 13.10.2025
By Jukka-Pekka
Comfortable base layer
Base layer feels nice against skin, material is soft and stretchy. Size M was M perfect, 176cm and 75 kg.Show full review -
Submitted 20.6.2025
By patrick hyde
Love it
Love everything about this base layer. I wear it each and every time it comes out of the washShow full review -
Submitted 11.6.2025
By Matthias
Baselayer
Angenehm zu Tragen, war bei Temperatur von 25 Grad bisher nicht zu warm.Show full review -
Submitted 9.6.2025
By Willy Loor
Nice product
I just started using these base layers and the first thing I noticed is they're soft and warm, perfect for late fall to early spring, they may be too hot for summer. The fit is good but a bit too long for me, I got an M and am 5'6" 148lb. But I like them and see me using them on colder days. For summer I will look for the lighter version of theseShow full review -
Submitted 30.5.2025
By Daan
So much comfort
I have been using this underlayer now for a couple of rides. All the plastic/polyester underlayers made my skin itchy. This merino is super comfy and soft. Cold wash and its good to go for the next run. Isadore is a new brand for me but super hyped about the quality. Im 185 84kg and size medium fits perfect.Show full review -
Submitted 23.5.2025
By BC
Soft and perfect fit
Excellent base layer. First time trying this brand so I think I’ll try some other items now that I can see/feel the quality.Show full review -
Submitted 20.5.2025
By Sven Schwerdtfeger
From Germany
Wie immer sehr gut
Der stoff ist sehr angenehm zu tragen scheint auch ein anderer feinerer zu sein wie die Baselayer T-Shirts . Dadurch konnte ich eine größe kleiner nehmen da er flexibler ist. Stinkt nich verarbeitung Top. Als Jahrelanger Kunde kann ich die Produkte weiter empfehlen.Show full review -
Submitted 16.4.2025
By Michael Kriegner
From Austria
Great materials
Size S (1,84 m, 74 kg) is perfect! Feels vety thin and dry, even during high intenseShow full review -
Submitted 11.4.2025
By Lu
Wonderful baselayer
Very well made shirt with nice detail on the collar. I’m 1.63 and 73kg and S is a tight but good fit, length is good too. Material feels soft on the skin.Show full review -
Submitted 11.10.2024
By emco
Très bien
Porté 3 ou 4 fois. Rien à dire sur la qualité. Taille S pour 1m78 et 68kg et c’est parfait, aussi bien coté longueur qui descend bien sur le bas des hanches que sur la largeur quand on aime que ça tienne bien le corps.Show full review -
Submitted 9.7.2024
By Ulf Ahrens
From Germany
Sehr guter baselayer
Dank der merinowolle sehr gut zu tragen. Über Nacht auslüften und nächsten Tag noch mal tragen ist kein Problem.Show full review -
Submitted 19.3.2024
By kyle
Very nice
10/10 would recommendShow full review -
Submitted 4.4.2023
By Melissa Segalov
From United Kingdom
Merino Base Layer feels great
My skin is very sensitive to wool in general but merino top this is brilliant.... Nice colour too. Great under my Spring jacket. It was a bit chilly out but my core stayed very warm. Perfect. I bought a M, but turned out too big, but not an issue. I've bought another one in a different colour and Small.Show full review -
Submitted 13.5.2019
By beno trček
From Slovenia
COMFORT & FUNCTION
Excellent,for the time being I don't have any comments!Base layer serves his purposeShow full review -
Submitted 2.9.2018
By Markus
Simply a charme
Very lovelly on the skin and works to keep warm without creating heat on a harder training session.Show full review -
Submitted 1.2.2017
By Pierre Geronimo Corvaia
From Austria
Essential item in my wardrobe
Sleeveless 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 6.11.2015
By cem atiyas
From Turkey
classsy colour and great wool feeling
great colours and material. very fit cut but still god feeling o n he skin.Show full review -
Submitted 23.10.2015
By Royce Walston
From United States
Perfect Styling
Base layers have always been a struggle for me. I could never find one that offered the comfort and temperature range suitable. This has all changed with Isadore. This base layer is perfect, with genuine comfort in a wide range of temperatures. Treat yourself to exceptional quality and comfort.Show full review -
Submitted 1.9.2015
By Stephen Ridett
From Denmark
Perfect comfort
Used my new sleeveless base layer today - together with my new Signature jersey - on a 2 hour spin. Very comfortable, nice fit and no annoying tightening under armpits when on the drops. Can recommend jersey and base layer.Show full review -
Submitted 27.7.2015
By Ed Newey
From Switzerland
Incredible bit of kit
I have now ridden with this in cooler conditions and in baking hot sun. it is amazing how well it performs in both environments. in cooler conditions the wool blend is cosy and just takes the edge off. This weekend on a hot sun baked, brutal mountain climb it wicked the sweat away and kept me extremely comfortable. At the top the temperature fell drastically. I zipped up, wool arm warmers on to begin the descent and it was back to cosy time again. Ive bought 2 shortsleeve layers (will get 1 more when restocked) and will order a long sleeve for the winter. One guy on this ride had the long sleeve on and even on the climb going into cooler air he found it worked beautifully. and on the train home we didnt clear the seats around us... Another fabulous product from IsadoreShow 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 20.2.2015
By Marcel Laros
From Netherlands
smooth fit
I like this Merino: no itching, but great in keeping the body dry. I also wear it casual because of the pleasant feel to the skin and perfect fit.Show full review -
Submitted 7.9.2024
By Emeline Montagnon
From France
Amazing
Super base layer. L (180/80) peut-être prendre un M pour être plus ajusté.Show full review -
Submitted 5.7.2024
By Juraj Gudaba
From Czech Republic
Super
Vyborny natelnik, super fitShow full review -
Submitted 28.8.2023
By Juliane
Juliane
We treated ourselves to the Women's Merino Sleeveless Baselayer Sulphur Spring 1.0 and Merino Sleeveless Baselayer Golden Oak 1.0 and are totally thrilled. The workmanship is great and it wears like a second skin! We almost only wear (merino) wool on skin and have various well-known manufacturers in our wardrobe. We are curious to see whether it will stand the test of time. You should definitely support Isadore: great service, fast shipping, lovely packaging, the quality and the colours are simply amazing.Show full review -
Submitted 13.10.2021
By Christoph Küenzi
From Switzerland
Herr
Wärmt bestens. Aber nach 3x waschen gemäss Angaben ist das Shirt total verzogen und hat bereits fusel. Sieht aus als ob es schon seit 5 Jahren in Gebrauch ist.Show full review -
Submitted 12.4.2021
By Marco Beck
From Germany
Herr
zunächst einmal gefällt mir die Firmenphilosophie, Stichwort Nachhaltigkeit, umweltfreundliche Verpackung etc. habe mir das SL und das Kurzarm-Shirt SS plus das Deep Winter Baselayer jeweils in Größe XL gekauft. Bin 187 cm und bringe muskulöse 88 KG auf die Waage. Die beiden Kurzarmshirts passen wie eine zweite Haut, fühlen sich super-angenehm an, bin schon jetzt begeistert. Ich mag den enganliegenden, kurzen Sitz/Schnitt. Wer es weiter mag sollte sich für eine größere Größe entscheiden. Das Winter Baselayer sitzt nicht ganz so körperbetont und ist deutlich länger geschnitten, reicht mir bis übers Gesäß. Ist jedoch nicht störend, dennoch hätte es hier vermutlich auch eine L getan. Sehr hochwertige Teile, klare KaufempfehlungShow full review -
Submitted 6.4.2021
By Martin
From Slovakia
Fantastic!
Fantastic base layer. You put it on yourself and you feel most probably the most comfortable material ever. You start your ride and you forget, that you have some base layer. You continue with riding.... you can see, that you are sweating, but you can't feel it. You feel just comfortable enough. This is the description of the good baselayer like this. + material is with very good feeling on the skin + sweat is wicking away + fast drying + unlike the baselayer with "holes," when you unzip your jersey or your jacket, you don't feel the colder air right on your skin - anyShow full review -
Submitted 13.10.2018
By Eduard
From Slovakia
merino žerú mole
do chladnejšieho počasie je to dobrý doplnok, len treba dať pozor že 100% merino chutná aj moliam, keď som ho po lete vytiahol zo skrine mám ho trocha sieťkované :DShow full review -
Submitted 14.9.2018
By Olivier
From Switzerland
Parfait
Une première couche que l'on ne sent pas et qui régule parfaitement la température de votre corps. Couleur originale. Coupe parfaite.Show full review -
Submitted 19.8.2018
By Francesco
leider schnell kaputt
Ich habe seit dieser Saison mehrere Teile von Isadore und bin von der Optik und der Qualität eigentlich begeistert. Auch dieses Unterhemd trägt sich toll. Ich habe es jetzt ca. 5-10 mal getragen und habe nun ein Loch im Brustbereich, welches sicher nicht mehr kleiner wird. Ich habe das Unterhemd immer mit der Hand und Merinowaschmittel durchgespült. Ich bin etwas traurig, dass es nur so kurz gehalten hat. Es ist immerhin nicht gerade günstig.Show full review -
Submitted 21.11.2016
By Reinhard Kinzl
From Austria
Reinhard
Trägt sich weich auf der Haut, perfektes Temperaturmanagement! Erst vor kurzem gekauft und schon mein Lieblingsteil! Größe S passt mir, 181cm, 76kg perfektShow full review -
Submitted 6.4.2016
By Claus-Dieter Kurz
From Austria
CD
the nicest & best baselayer I've ever worn!! Only one thing for improvement: the length could be 3 -5 cm longer (my size M for 185 / 72)Show full review -
Submitted 20.5.2015
By Arno Nym
angenehm zu tragen
Man merkt gar nicht, dass man das Shirt anhat, bis man angekommen ist, Jacke auszieht und sieht, wie man geschwitzt hat. Ich fühle mich dabei nicht nass oder kalt, sondern angenehm. Das Shirt ist in kurzer Zeit wieder trocken und kann für die Heimfahrt direkt wieder genutz werden. Einzig der leichte Wollegeruch könnte als störend empfunden werden... Ich habe es auch schon mit normaler Sportwäsche bei 30° mitgewaschen - formstabil! als einziges habe ich beim Aufhängen das Rückenteil mit Klammern beschwert, dass es sich nicht einrollt. Ich werde definitiv noch weitere davon kaufen!Show full review -
Submitted 9.1.2019
By Daniel C
From Germany
100% Merino SL Baselayer - Too short!
Nice looking, good quality, and probably good functionality. But a terrible fit! It is way too short! All my Isadore jerseys fit perfectly (XL for 194cm, 92kg), but the baselayer doesn't work at all for me. The baselayer is shorter than the jerseys, and as its 100% Merino, it's riding up on your back leaving your lumbar section exposed. I my opinion, baselayers should be could rather long, as they worn under the bibs. If you are rather short and/or don't mind your ass and lower back not being covered by anything but the bib, the baselayer might be ok. If you are tall and/or want the baselayer to cover more, stay away.Show full review
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