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Tri-zone heat boosted base layer bottom. Micro-carbon fiber heating elements are placed on targeted areas to ensure warmth for hours. Provides adjustable heat through one panel in each knee and one in the rear hips. Features Smart Preheat technology designed to quickly boost heat output and then automatically switch the setting to low for energy conservation. Includes rechargeable lithium-ion battery, 100-240V battery charger, and instructional guide.