High-quality SOFT Polyester Spandex Blend - Stretching Quick Dry, Soft, breathable Fabric Wicks Sweat Away from Your Skin; Keeps Your Body & Muscle Cool and Dry. The Stretching Fabric Allows Greater Mobility in Any Direction. Machine Washable. Quick Dry - Breathable fabric make sweat away from skin , Excellent breathability and ventilation offers a comfortable experience while training. Workout T-shirt with Curved Hem - Not only great for gym, running, sports and fitness, but also for everyday wear. Soft and Elastic fabric with 4-way stretch construction moves better in every direction. Perfect for Gym, Physical Fitness, Weight-Training, Workout, Bodybuilding, Running, etc. US SIZE - Muscle Fit. If you want a tighter fit, please choose one size down. More size information please check size chart in the THIRD picture.