Baleaf Men's Cool Dry Skin Fit Long Sleeve Compression Shirt 88% Polyester/12% Elastane Breathable, soft and moisture-wicking fabric keeps you dry and comfortable during your training Stretchy and durable material grabs your muscles tightly and improves your performance 4 Needle flat seam minimizes irritation caused by chafing Ergonomic compression fit for enhanced range of motion Please order ONE SIZE UP than you normally wear if you prefer less tightly fit