Royal Robbins Billy Goat classic gets some serious stretch in this travel-friendly, comfortable and durable denim. Billy Goat Stretch Denim also features UPF 50+ protection and just a touch of spandex to enable that all-important stretch. 11.5 oz., 98% Cotton/2% Spandex, enzyme and stone washed, UPF 50+. Contemporary rise. Boot cut. Natural fit. Logo rivet reinforced pockets . Back patch pockets.