100% cotton. Loopback fabric. 1/4 fastening. Stand collar. Ribbed cuffs and hem. Slightly small sizing. The Stone Island Quarter Zip Sweatshirt is indeed a tortoise-throated sweatshirt. No prizes for guessing that. What the moniker doesn’t tell you however is that this doozy has been made from a particularly potent loopback cotton which is as slick as it is stout.