100% Merino SS Baselayer

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.

Explore More
80,00 USD
  • Free standard EU shipping on any order over 150 EUR
  • Express EU delivery 1-2 business days
100% Merino SS Baselayer Black
100% Merino SS Baselayer Black 80,00 USD

Natural Merino fibers to keep you naturally comfy

5 / 5
38 reviews

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.

Miguel van den Wildenberg, Netherlands

Product description

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.

  • Constructed from 180g/m 100% Merino wool 
  • Soft to the touch
  • Excellent moisture wicking properties
  • Easy to care for with cold water washing
  • Designed by Martin Velits using his experience from the pro peloton
  • Made in the E.U.
  • 100% Merino wool
  • Multiple color options
  • Slim performance fit
  • Distinctive collar cut construction

Size Guide


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


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.

Sizing guide


5 / 5
38 reviews

  • Comfortable and breathable

    Nathan Thomas, United Kingdom, 19.5.2020

    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
  • Excellent

    Pascal Gerritsen, Netherlands, 4.9.2018

    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
  • Spot on

    Mark Botham, United Kingdom, 17.1.2018

    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
  • Base Layer Revelation

    Age MacKenzie, United Kingdom, 8.5.2021 (100% Merino SS Baselayer Golden Oak)

    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
  • sizing

    Florian Fellner, Germany, 18.1.2021 (100% Merino SS Baselayer Grey)

    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

Load more

Related Products

100% Merino SL Baselayer Black
100% Merino SL Baselayer Black
+ Quick Add
100% Merino LS Baselayer Black
100% Merino LS Baselayer Black
+ Quick Add
49 Reviews
85,00 USD
Ovada Deep Winter Baselayer Black
Ovada Deep Winter Baselayer Black
+ Quick Add
14 Reviews
115,00 USD
100% Merino SS Baselayer Atlantic Blue
100% Merino SS Baselayer Atlantic Blue
+ Quick Add
38 Reviews
80,00 USD
Atlantic Blue

Vibes from the road

Don’t forget to tag @isadoreapparel when showing off