Skins ignite a400 top short sleeve optimum performance adaptive technology will keep you feeling warm when its cold and cool when its warm while our dynamic gradient compression ensures that your upper body is getting the right amount of compression around your core for much needed stability and support for extra comfort and durability skins have added a seams which are up to 30 stronger than standard seaming and theyre flatter too so theres no risk of chafing stay cool calm and colle