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A whole new level of foot care. The exclusive technology – from a thin, flexible construction to the insole-shaped design – redefines the air-activated warmer. Put the Heat Treat foot warmers in shoes or boots for 5+ hours of soothing heat. Packaged as a pair. No. CSFWSM12: Small/medium – men’s shoe size 4 to 7, women’s shoe size 5 to 8 No. CSFWML12: Medium/large – men’s shoe size 8 and above, women’s shoe size 9 and above