Feature: 1. EXTREMELY COMFORTABLE: Our inversion boots are made of premium foam to provide a comfortable fit. It is recommended for those with thin legs to wear thick socks or use a towel as extra padding for safety. 2. MULTIFUNCTIONAL: By using these inversion boots, you can relieve back discomfort, muscle tightness and cramps. Exercising your abs is a more effective exercise for upside down back stretching. 3. SAFE AND NON SLIP: The inversion hang up boots to perfectly fix on any size ankles and feet, with a strong safety lock to make sure the feet and ankles won't slip off the boots. 4. STRONG LOAD BEARING: Made with heavy duty metal hooks to carry and secure a large amount of weight on most sizes of pull up bars, can hold up to 120kg/264.5lb, also comes with metal straps and safety double locks to ensure that the user's feet and ankles are safe. 5. APPLICATION: These upside down hang boots can be secured to most sizes of pull up bars (less than 30mm in diameter), ensuring that the boot hooks are securely fastened to the bar. It fits snugly and comfortably around the ankles, with intervals of 30 seconds to 2 minutes. Specification: Item Type: Inversion Boots Material: Foam, Steel Scope of Application: Pull Up Bar, Large Fitness Equipment . Package List: 1 x Pair of Inversion Boots1 x Assist Band Note: 1. The safety lock buckle must be securely fastened, please double check before exercising to prevent accidents. 2. The high density foam material is soft and comfortable, but easy to be punctured by pointed objects; if you need to adjust the position of the boots after wearing it, please make sure to open the lock buckle before adjusting, strictly prohibit directly pulling the foam, otherwise it may cause damage to the foam.3. The diameter of the hanging rod should be within 3cm/1.2in.