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Feel the warmth of a one-of-a-kind heater liner. Features: Active Heat Technology: 3 levels of temperature adjustment (built-in controller) Removable lithium polymer battery that can be charged by USB. True fit construction. DRYRIDE HeatCycle plush cuff 1.0 Velcro closure level 2 molded EVA footbed / ESS support shank / Aegis antibacterial coating for heat molding.