Pulling on an extra layer when the thermometer's rising might seem counterintuitive, but a proper base layer, like the Women'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.