The fabric on the Kjus Cosmos Short Sleeve Tee wicks moisture extremely fast That means that when you wear the Cosmos Shirt during warm weather activity its going to get rid of sweat before it can build up and make you uncomfortable The fabric on the Cosmos Shirt is also highly odor resistant making it a great choice for aggressive adventures 59pct polyester/41pct polypropylene fabric Lightweight and breathable to keep you comfortable Fast drying and moisture wicking to keep you dry HeiQ silver fibers resist odor buildup HeiQ adaptive fibers respond to excess body heat with increased moisture wicking Flatlock seams feel soft against skin