Heat Factory Adhesive Toe and Foot Warmer - 6+ Hours Heat Each (8 Pair Warmers) for $7.92

Heat Factory foot warmer insoles are designed to heat in the restricted air environment of a shoe or boot. Ideal for daily use in shoes, ski boots, or whenever feet are cold. Peel back the adhesive backing and press warmer to outside of sock under foot for comfortable warmth. Provides soothing, gentle heat for up to 8 hours.