There's a nearly unlimited number of base layers out there, but the Showers Pass Long-Sleeve Body-Mapped Women's Base Layer is a little different than most. It's designed expressly to be worn under Showers Pass jackets, with open-knit venting at the center back and underarms that works in concert with the vents in most Showers Pass outerwear to keep you dry and comfortable.
It's made from a blend of merino wool, modal, spandex, and nylon to create a fabric that's naturally soft, antimicrobial, durable, stretchy, and breathable. The close-to-skin fit improves moisture transfer, and the seamless construction prevents chafing. Showers Pass also endows this baselayer with a long cut for full on-bike coverage, a wide hem to prevent it from riding up, and thumbhole cuffs to seal out drafts and moisture.