A brand of jockstrap from the manufacturer "Jock Sock" featuring a pouch for supporting the male genitals that is sewn directly into the waistband, obviating the need for straps.
Oscar-winner Yul Brynner was the face of Jock Sock in "Yul Brynner for Jock Sock" advertisements carried in comic books and men's magazines in the late 1960s.