The Giordana FormaRed Carbon Jersey makes navigating through a Cat 5 peloton down a steep mountain descent look simple. Several types of material make the Giordana FormaRed Carbon Jersey more fun to wear than to discuss. Asteria has body-conforming characteristics that rival anything available on the market today. Ametista has threads of carbon woven through it, adding strength without adding weight. Stretch-limiting MCK fabric forms a Y-shape on the back of the jersey, preventing your pockets from sagging when you stuff 'em with more supplies than you really need.