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The ThermaCELL ProFLEX thermal heated insoles were designed to keep your entire foot warm in cold weather. These insoles can fit in any one of your shoes and are more comfortable than a foot warmer packet. These insoles come equipped with several layers of insole material for all day comfort. The polyurethane foam is breathable, transfers heat efficiently, has great shape retention and shock absorbency. This is the first heated insole with rechargeable, removable batteries and a remote control. These batteries can easily be Charged with the included wall charger or any USB Port. The thermal heated insoles Pro Flex come in size XL to fit men's shoe sizes 9.5-11 or Women's shoe size 10.5-12. Please thoroughly read the instruction manual before use or see heat.thermacell.com for the online manual. Thermacell is the leading Designer in products to keep you either hot or cold no matter what outdoor adventures you are interested in.