DetailsStio Size Chart The mountain-towner’s favorite pair of jeans needs to do a little more than the classic denim staple. They need to look how he feels: relaxed. They need to work how he plays: harder than the rest. Doing just that and more, the Rivet Jean is constructed from 99% cotton with 1% spandex for a stretch denim made for comfort and mobility. An action gusset provides extra range of motion, while custom Stio® rivets offer reinforcement. An ideal combination of old and new and an easy everyday choice for everyday life.