Skivvies Rear Admiral Jock Brief. 61% Polyester, 30% Viscose, 9% Spandex. Soft and comfortable yet sharp and exciting describes the new Skivvies Rear Admiral Jock Brief. Fits like a brief but works like a jock (check out the back) but with a new twist. We've incorporated our enhancement pouch that holds the goods up and out for a nice presentation. Great for all day wear, to the gym, or for those special times where sexy fashion is required. Small (28-30).