The washer on top of and inside the cap provide long-lasting strength to the cap assembly

semi rigid plastic support piece coved with a special cushion pad that is impregnated with activated charcoal to help absorb odor

With RelaxFlex function  for comfortable cushioning of the footpad

great on boots

but it also is a secret weapon for household surfaces and all types of leather

JR Half Sole 4.0 - 4.4 MM H14(#JR4) - One Pair Acrylic Finisher The washer on top ofJR Half Sole 4. 0 4. 4 MM H14(#JR4) One Pair Built for the most demanding environments and activities, solid soles are designed for maximum grip, durability and traction. With trimmable soles of various compounds and lug design, our solid replacement soles are the perfect option for full sole repair. Made with the quality is known and trusted. Adds extra lift and cushion for the entire length of the foot when you cut to fit. Use to repair worn out