Different federations have different rules and different interpretations of the rules, leading to a myriad of variations. Differences arise on the equipment eligible, clothing, drug testing and aspects of allowable technique. The 100% Raw Federation allows no supportive gear to be worn by the lifter while the IPF, AAU, NASA, USAPL and the ADFPF only allow a single-ply tight polyester squat suit, deadlift suit and bench shirt, wraps for knees and wrists, and a belt in the equipped divisions. Other federations, such as the APF, APA, IPA, SPF, WPC, AWPC and WPO, allow opened or closed back bench shirts, multi-ply gear, and a wide array of gear materials such as canvas, denim, polyester etc.