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Custom Private Label Air-Activated Self-Heating Insole Foot Warmers

Product name: Self-heating insole foot warmers Heating duration time: 8 hours, or customized Air-activated: Instant heat within minutes Size: S, M, L, XL, custom size Usage: Keep warm in winter Average temperature: 40℃ Highest temperature: 48℃ Shelf life: 3 years

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