The Tempo Muscle Tank is crafted with ChillMesh(TM) fabric to keep you cool on the trails. It features a semi-relaxed fit, wide shoulders, and elevated details. We love it for: trail running & racing ChillMeshTM: 88% cooling polyester, 4% polyester & 8% spandex Cooling, breathable, lightweight & smooth WickMeshTM side panels: 95% polyester & 5% Spandex Wicking, breathable & lightweight Lightweight & smooth Semi-relaxed fit Cropped fit Reflective logos & back bar Machine wash cold, tumble dry, don&';t bleach Designed in California, made abroad