★Mens sleeveless shirts: made of light weight stretchy jersey,soft comfy and breathable. No Worry about shrinkage and deformation.90%polyester 10%spandex ★Workout tank tops: moisture wicking and quick dry fabric offering you dry and cool feeling in sports training.No tag collar reduce rubbing. ★Relaxed fitting for maximum range of motion.Please check attached size chart picture before order to ensure fitting.Reference: Model 5’11 ft./ 182 lbs. wears size L. ★Machine wash cold,gentle cycle wash separately or with like colors only.For DARK COLORS (black/purple plum etc.), strongly suggest wash before wearing. ★This muscle shirt allows full range of motion and flexibility.Suits for running, jogging, gym, yoga, basketball, football etc.