Tonyko Inversion Gravity Boots 1.VERSATILITY Perform a Wide Variety of Exercises 2.BENEFITS Prevent and Relieve various diseases caused by long time sitting and standing , such as cardiovascular disease, lumbar, cervical spondylosis and so on 3.SAFETY High strength stainless steel hooks and double easy-installed locks for your safety 4.COMFORT Thick , comfortable high density soft NBR foam pad to protect your legs & ankles , fit for most people 5.100% SATISFACTION GUARANTEED High quality gravity boots with 100% satisfaction guaranteed. Promise that If you are not satisfied with Tonyko Inversion Gravity Boots, we will replace or refund your gravity boots until you are satisfied.