... , small size.3. Waist Belt: Fasten with buckle, length adjustable.4. Fast tube connector: Small size, may be assembled with ... pressure safety device, easy to swich on and off.7. Back support/ Back frame: Carbon fiber material, flame resitance, strong and light, ... wear.8. Shoulder Strape: Made with flame resistance ployester, length adjustable, with foam cusion, confortable to wear.9. Air pressure ...