Pulling on an extra layer when the thermometer's rising might seem counterintuitive, but a proper base layer, like the Men's SL Sleeveless Base Layer, can make all the difference. Wearing a lightweight base layer helps wick sweat away from the body, generating an even greater cooling effect. This is all due to the wicking properties of our VaporRize™ mesh fabric. To top it off, features like soft-puff stitching eliminate abrasion-inducing seams, while our Slim Fit conforms to your body.