Bontrager B1 Sleeveless Women's Baselayer | Trek Bikes (GB)
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Bontrager B1 Sleeveless Women's Baselayer

£25.99 £32.99 Model 14372

An ultralight, cooling, sleeveless baselayer for women that provides warm weather comfort.

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Secretly cool

Even warmer rides can benefit from the right baselayer. Bontrager's lightest weight baselayer fabric, B1, is a comfortable first layer of Profila Cool fabric enhanced with 37.5 technology that regulates the body’s relative humidity to maintain ideal core temperature, allowing greater on-bike performance. Comfortably fits under every jersey you own.

Product details

  1. Profila Cool fabric powered by 37.5™ active particle technology
  2. Conditions-appropriate, tuckable length
  3. Drop tail for a precise on-bike fit
  4. The fitted cut provides a streamlined body fit for enhanced performance

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B1 Sleeveless Women's Baselayer

B1 Sleeveless Women's Baselayer

An ultra-light, cooling sleeveless baselayer for women that provides warm-weather comfort.

Cycling-specific fabrics

Cycling-specific fabrics

Profila fabrics are designed to wick moisture away rapidly and dry quickly for superior breathability to keep you comfortable.

Maximum breathability

Maximum breathability

37.5 fabrics push moisture to the outermost layer of clothing for rapid evaporation. When you use less energy to regulate your temperature, you have more energy for riding.

Streamline your wardrobe

Streamline your wardrobe

A fitted cut provides a streamlined body fit for enhanced performance and a next-to-body silhouette. If you prefer a roomier cut, select a size up on this garment.


Gender Women
Fit profile Fitted
Fibre content 66% Polyester/19% Cocona 37.5 Polyester/15% Spandex
Material Knit
Sleeve length Sleeveless
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.

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