100% Merino LS 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.

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85,00 USD
Maritime blue
  • Free standard EU shipping on any order over 150 EUR
  • Express EU delivery 1-2 business days
100% Merino LS Baselayer Maritime Blue
100% Merino LS Baselayer Maritime Blue 85,00 USD

Natural Merino fibers to keep you naturally warm

5 / 5
49 reviews

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.

Luca, Germany

Product description

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. Merino 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 250 g/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
  • Thumb loops for the coldest days
  • 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
49 reviews

  • Comfortable and breathable

    Nathan Thomas, United Kingdom, 19.5.2020

    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.
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  • Comfortable and form fitting for colder rides

    Kris Terauds, Canada, 7.1.2019

    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.
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  • High quality merino

    Philippe Lemmens, Belgium, 9.6.2018

    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.
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  • Too short

    Roger Murer, Switzerland, 4.1.2022 (100% Merino LS Baselayer Black)

    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.
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  • Great product

    Eduard Winkler, Slovakia, 26.11.2021 (100% Merino LS Baselayer Marsala)

    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.
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