Coovy Sports Compression Under Base Layer Armour Short Sleeve Shirts Rash Guard Nylon 88% Polyester 12% COOVY lightweight compression base layer shirts. This moisture wicking baselayer keeps you dry and cool without loosing mobility and comfort 360-degree full stretch construction to help enhance muscle mobility Smooth and sleek patented fabric is light, durable, and comfortable, so you won't be weighed down 100% SATISFACTION GUARANTEED!! 30-day return accepted. We also have various tights, short-sleeve tops, and winter models. Please search for "COOVY" to see our full line of products.