Assembly Required Dual Heat and Massage Pad, consisting of two affixed components-one for the neck area and one for the back area Longer Ankle Holding Knob for easier release with Ergonomic Ankle Holding System (with our unique, patented No Pinch VCC-Tech U-shape Holders True Balance System for easy inverting Six (6) Position Adjustable Pin System with added Patented Protective Cover for easy positioning Accommodates users 4ft-10in to 6ft-6in with a 300 lb Weight Capacity Consult with a licensed physician before starting any new exercise regime.