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

Natural Merino fibers to keep you naturally warm

5 / 5
49 reviews

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.

Eduard Winkler, Slovakia

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

  • size it one up :)

    Florian Fellner, Germany, 14.3.2021

    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.
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  • Very nice

    Miguel van den Wildenberg, Netherlands, 18.10.2019

    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.
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  • Nice baselayer

    Ignacio Prieto Diaz, France, 8.2.2019

    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.
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    Vaughan Watson, United Kingdom, 20.2.2018

    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!
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  • Best baselayer I have owned

    Ian Bowden, United Kingdom, 23.12.2017

    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.
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