BLENDING BREATHABILITY WITH WARMTH. When the temperatures stay cool, get ready to heat up your workout. The Cirriform Long Sleeve 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 Mesh sides and underarm 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: 4.6 oz / 130.0 g MATERIALS Primary/Body: 87% Polyester, 13% Spandex Secondary: 6% Polyester, 83% Cationic, 11% Spandex | Ultimate Direction Women's Cirriform Long Sleeve in Onyx Size Large