The Salomon Men's S-Lab Exo Zip Tee has superior moisture-wicking properties that will keep you dry, cool and comfortable as you train. The tight fitting tee provides postural support to your chest and upper body while improving oxygen intake during running. Made with Actilite fabrics (stretch, stretch mesh, and jersey) that wick moisture away from your skin to improve comfort when you start to sweat. Reflective branding on the front and back provides increased visibility during night and early morning runs. Flatlock seam construction prevents chafing. Exo Sensifit technology is designed to help your muscles work more efficiently so that you can run longer, run easier, and recover better. The longer arm sleeves provide an improved fit. Smart Skin body mapping design allows for linear running motion. 5.5" zip with lockdown zipper and garage for extra breathability while training. Sizing (Chest): S: 34-37", M: 37-40", L: 40-43", XL: 43-47".