The Jack Adams Army Fly Jock Brief takes the brief/jock hybrid design to the next level with an unprecedented functional fly and a spacious front pouch. The design gives roomy support unlike any other jock brief and is perfect for athletic wear. Made from 90% Cotton and 10% Elastane. XLarge. Chest: 44"-47". Neck: 17"-17.5". Waist: 36"-38".