Medium/Large, Bx/30 Pair * Foot Warmers are thin, comfortable air-activated Warmers that fit in your shoe or boot, and provide over 5 hours of soothing warmth beneath your feet * Warmers are widely used for portable, long-lasting heat therapy * Perfect for sufferers of cold, sore feet and toes as a result of Arthritis, Raynaud's, Lupus, Scleroderma, Sjögren's, Myalgia or just poor circulation * Designed for one-time, disposable use * Ultra thin, full foot warming insoles * 5+ Hours of warmth * Average temperature 95 degree F *