SKINS Mens DNAmic Men's Compression Sleeveless Top 75% Nylon/25% Elastane Imported World's first dynamic Gradient compression delivers more oxygen-filled blood to active muscles, increasing endurance, power, and efficiency Enhanced support through the core/trunk area for supreme postural support UPF 50+ UV protection and chafe free flat lock stitching Wear during activity for enhance performance and post activity for quicker recovery SKINS performance compression: it's equipment, not clothing