Bontrager B1 Sleeveless base layer review

One of Bontrager’s extensive range of base layers, the B1 sleeveless provides good summer weather performance

Bontrager B1 Sleeveless base layer
Cycling Weekly Verdict

Provides good wicking and temperature control performance in hotter conditions, but be careful to get the right size as the Bontrager B1 Sleeveless base layer is not as stretchy as some

Reasons to buy
  • +

    Good wicking performance

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    Comfortable, close fit

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    Good tail length

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Reasons to avoid
  • -

    Not as stretchy as some others tested

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

At first sight, the Bontrager B1 Sleeveless base layer looks like a very lightweight option. But it’s not quite as light as it looks, with the fabric used a bit denser than some of the competition. The Profila Cool fabric has a mesh structure, with areas of thinner fabric between the more structural parts.

>>> Buy now: Bontrager B1 Sleeveless base layer from Trek's webstore for £32.99

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Paul Norman

Paul started writing for Cycling Weekly in 2015, covering cycling tech, new bikes and product testing. Since then, he’s reviewed hundreds of bikes and thousands of other pieces of cycling equipment for the magazine and the Cycling Weekly website.

He’s been cycling for a lot longer than that though and his travels by bike have taken him all around Europe and to California. He’s been riding gravel since before gravel bikes existed too, riding a cyclocross bike through the Chilterns and along the South Downs.