Material Contains non-textile parts of animal origin Armalith Stretch Denim Comfort stretch panels at back & knees special stretch material in crotch Zips at ankles air-vent zippers 4 external pockets Safety Connecting zip pocket for optional Held cloverleaf SAS-TEC® proved coccyx protector optional hip protectors EN 1621-1 approved height-adjustable SAS-TEC® Slim-Line knee protectors