MVPSH19,MVPSH02,MVPST16,MVPTT06,MVPTT01 Made of Premium Cotton Blend - Features a better soft Cotton blend which is breathable, shrink-resistant and more comfortable. And it's great for better drape and fit to highlight the muscles and perfectly show the results of your workout in the gym. GWYHD01L,GWYHD03L,NYBTT16,NYBTT06 Made of 100% Polyester - Mesh Quick Dry, Soft, breathable Fabric Wicks Sweat Away from Your Skin; Keeps Your Body & Muscle Cool and Dry. Mesh fabric provide targeted ventilation. Machine Washable. Workout tank top with Muscle cut - Perfect for bodybuilders, gym fanatics, and men with muscular athletic physiques. Premium Cotton Blend features moisture-wicking, keep you cool while training. Sleeveless shirt with Crew Neck is not only great for fitness, gym, running, but also perfect for beach, daily wear. 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. Easy to care - Machine wash cold.