From beginners to expert racers weighing from about 154.3 lbs (70 kg) to 244.3 lbs (110 kg). If you are a pure competitor or or demo instructor, Mogul or Freesie, this model is perfect for you. When using the booster strap, you will need to process it by yourself or at the shop. Match the hole of the standard power belt and drill a hole in the booster strap and secure it with screws or rivets.