Men's Sleeveless Base Layer

The Men's Sleeveless Base Layer is the summer-weight PNS layer with the sleeves left off — a slim-fit polyester-and-elastane piece that wicks sweat off the skin on hot training days and disappears under a short-sleeve jersey. It is the warm-weather opposite of the thermal models in the range: breathable, moisture-wicking, and built for the days when the problem is heat, not cold. For the compression race-day version, see the Mechanism Pro Sleeveless.