The Lightweight TransDRY™ Cotton fabric weighs in at a breezy 4.5 oz/sq. yd., with all the breathability and comfort of summer cotton, but with the added performance benefits of wicking and quick drying. All Year Gear™ for all-season wear. Super lightweight, wicking, and comfortable next to skin, All Year Gear™ is a collection of performance underwear made of revolutionary TransDRY™ moisture wicking cotton. Using the first truly technical, wicking cotton fabric that actively moves moisture to the outside of the fabric where it can evaporate faster, drying twice as fast as regular cotton, Polarmax's cotton apparel with TransDRY™ provides all the comfort you've come to expect from cotton, but with highly efficient performance features.