5.3oz, 89% Polyester, 11% Spandex Single Dyed Jersey. 40+ UV protection. Four-way stretch fabric. Rich, cotton-like feel. Stylized two button placket. Buttons with side 'Spyder' etching. Threaded grommets to improve ventilation. Back dart. Side vent. Iconic rubberized Spyder bug logo at left sleeve. Rubberized Spyder wordmark at center back.