Zoot Sports Men's Performance Tri Sleeveless Jersey Body: 80% Nylon / 20% Creora Spandex, 193gm2/Inset: 82% Polyester / 18% Spandex, 200gm2 /Mesh: 86% Polyester / 14% Spandex, 219gm2 Imported SeamLink stitch construction ensures next-to-skin comfort, minimizes chafing and stretches with fabric Performance Endura fabric to help you stay dry and comfortable Mesh panels at back for enhanced breathability Three back pockets for nutrition storage with bonus zippered security pocket Reflective details for visibility in low-light conditions