High ventilating premium running singlet. The warmest workouts require the coolest coverage. The Cirriform Vest is breathable and comfortable, with quick-wicking fabric and mesh body mapping material in the heaviest sweat zone. Whether you're running in the mountains or on the road, the seamless shoulder area is optimized to comfortably wear a running vest. FEATURES Full mesh back for increased breathability in the body's highest sweat area Reflective logo to help keep you visible when running in low-light conditions SILVADUR(TM) Advanced Microbial Control and moisture wicking Flatlocked anti-chafe seams UPF 20+ Seamless shoulder design for maximum comfort and compatibility with running vests and packs SPECS Weight: 3.9 oz/ 110 g MATERIALS Primary/Body: 92% Polyester, 8% Spandex Secondary: 92% Polyester, 8% Spandex | Ultimate Direction Men's Cirriform Vest in Zion Size Medium