The ultimate cold weather warmer the optimus softshell arm warmer keeps the rain away from the skin without letting you overheat perfectly matched with the road race optimus jersey unlike other softshell garments the optimus warmers provide huge amounts of 4 way stretch for a superb fit the waterproof softshell fabric provides excellent warmth even when wet lightweight lycra fabric behind the knee to prevent overheating flatlock stitching eliminates any unwanted chaffing or discom