Sleeveless Base Layer Evo An evolution of our trusted original, the Sleeveless Base Layer Evo delivers enhanced performance with an improved ergonomic fit and advanced fabric technology. Now featuring a more stretchy, form-fitting construction, it offers increased comfort and freedom of movement, while maintaining its moisture-wicking and breathable performance. Designed to regulate body temperature in both hot and cool conditions, this lightweight base layer adds next-to-skin comfort without the bulk—perfect for year-round riding, from high-summer heat to brisk early morning starts.