Providing warm, dry next-to-skin, moisture wicking performance, the Arcteryx Rho LT Bottoms for Boys uses lightweight synthetic fibers to move moisture rapidly and a silver ion treatment to remove odor during any endurance endeavor. An ideal warmth-to-weight ratio base layer for backcountry adventurers, the snug fit of the Rho LT Bottoms are Built to be worn alone during cool weather aerobic activities or layered up when the temperatures are lower and you necessity more Safe guardion from the elements.