Champion Men's Sprint Muscle Tee shirts closure Mesh-textured fabric wicks sweat and dries quickly, to keep you cooler and drier. Tonal and contrast mesh insets add extra cooling power. Non-chafe ergonomic seams enhance your ease of movement. Details add practical value: contrast fabric-taped neck seam; raglan sleeves for range of motion; reflective trim for night-time safety. BODY: 4.4-oz. 95% polyester/5% spandex. MESH INSETS: 3.35-oz. 92% polyester/8% spandex