Foam Boots Relieve and off-load Heel Pressure. Heel insert covered w/low friction fabric for reduction of sweating & friction burns. 2 soft, comfortable cozy cloth tie straps w/Xtra foam pad for extending the length or height. Multiple ventilation holes for cooling affect. #503400-smooth   #503450-convoluted foam. Universal Size Sold Each. use with #503098-Anti rotation holder Latex Free UNSPSC#42241700