Invert in comfort and security with the only gravity boot designed with a two-buckle closure. EZ-Up Gravity Boots flex comfortably around each ankle with a dual-lock ratchet system that adjusts to fit a range of users. Calf Loops enhance support by eliminating uncomfortable loads on the knees and feet. Get a serious core leg and glute workout with compression-free sit-ups and inverted squats or invert post-workout to relax and recover. use with Teeter Inversion Tables* Inversion Racks & Bars or appropriately-sized bards** at the gym. *When used with the Adapter Kit the Gravity Boots are compatible with all pin-lock Teeter Inversion Tables (EP-560 FitSpine X1 NXT-S) ** Maximum bar diameter of 1.25 (3.2cm). Ensure a secure durable platform before attempting inversion on non-Teeter equipment.