Hock boots have two coils for complete penetration of the hock joint. Use for poor circulation, trauma, arthritic conditions, spurs, spavins. Connects into the blanket's stifle pocket; this means you can operate the blanket and hock boots all at the same time. Within 30 minutes the therapy is complete!! You must have one of the Bio-Pulse Blankets in order to use this product. Ask us about rental options.