Base Layer Information

During all types of weather, a base layer is the first, next-to-skin layer in any cycling kit. The job of a base layer is to transport moisture away from your skin to the outside of the fabric, where it spreads out over the surface and quickly evaporates. This helps to regulate body temperature by keeping your skin dry. Cycling base layers are commonly made of synthetic materials or merino wool.

Nonabsorbent synthetic materials, usually polyester, readily wick moisture and are the quickest drying of fabrics. They have an excellent amount of stretch and are inexpensive. Although some are treated to be antimicrobial, they usually need to be washed between uses to prevent bad odors from forming. Merino wool absorbs up to 36% of its weight in moisture while allowing it to evaporate, so it is fantastic at wicking. Although it does not dry as quickly, it is warmer than synthetics. Wool is naturally antibacterial, so it can be worn several days in a row without stinking, which makes it perfect for touring or for people who would rather ride than do laundry.

Summer base layers are sleeveless or short sleeve and have low-profile collars. They are made of lightweight synthetic materials or thin merino wool. Thin synthetics are best for hot weather, because they retain no warmth. On warm days, a thin wool layer is surprisingly cool, and it will be comfortable during descents or surprise showers. Winter base layers are short or long sleeve, and have taller collars that keep the neck warm. They are constructed of thicker, more insulated fabrics. Synthetic pieces have a waffled or ribbed texture that traps warm air next to the skin. Merino wool base layers are best for cool to cold weather because they retain warmth without adding bulk underneath a cycling jersey or jacket. New fiber technologies ensure that wool garments feel soft next to the skin and are machine washable.

Men’s and women’s base layers for cycling should be form-fitting in order to maximize wicking properties. They are cut to fit your body on the bike and are long in back so they can be tucked into bibs or shorts. Raglan sleeves ensure that you can move shoulders freely. Some base layers are seamless, but most are sewn with flat-lock stitching that feel smooth next to the skin. In all four seasons, base layers help riders get the the most our of their cycling apparel!