Kookaburra Jock Strap The Kookaburra Jock Strap is constructed from a comfortable cotton/lycra material and is designed with an integral pouch. Built with a skin fit, the Kookaburra Jock Strap is a comfortable fit as the Jock Strap can be worn during the whole days play to help boost performance and claim the victory. The Strap fits nicely and securely under cricket trousers.