5.3oz, 89% Polyester, 11% Spandex Single Dyed Jersey. 40+ UV protection. Four-way stretch fabric. Rich, cotton-like feel. Relaxed front placket. Threaded grommets to improve ventilation. Stylized back seams. Side vent. Iconic rubberized Spyder bug logo at back neck. Rubberized Spyder wordmark at right side.