It's not a jock (there are no legstraps), it's not a thong (there is no butt strap) - it's a sack sock, with just a waistband and pouch to hold your boys. The pouch includes a soft elastic trim that runs under your sack and holds everything up and out without the pullback of traditional jocks and thongs. Made from a conforming and stretchy blend of cotton/lycra, this sack sock is sure to become one of your favorites!