What is an Unna boot ? An UNNA boot is a type of compression bandage that is used to manage and treat venous insufficiency, venous ulcers, and other conditions related to poor circulation in the legs. It is a simple, effective, and cost-efficient method of providing compression therapy. The UNNA boot is a semi-rigid, non-elastic bandage that is impregnated with a thick paste or gel made of zinc oxide, glycerin, calamine, and other ingredients. When applied to the affected leg, the boot creates a