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Plus, with an extra set of rechargeable/removable batteries (sold separately), your feet stay warm all day. Wireless Remote controlled – fingertip control of heat without removing your footwear. 3 heat settings: medium (100 F), high (111 F), and no heat. Rechargeable, removable batteries (2 included). Battery charges in 4 hours using wall charger or any USB port. Charge lasts up to 5 hours. Batteries are easy to change without removing insole from boot or shoe. Flexible polyurethane insole material easily inserts into a variety of shoes and boots. Insoles are breathable, shock absorbent, and conduct heat well for advanced comfort. Additional ProFLEX batteries sold separately.
Sizing:
Insole - Shoe size
Small - 3.5-5M / 4.5-6W
Medium - 5.5-7M / 6.5-8W
Large - 7.5-9M / 8.5-10W
XL - 9.5-11M / 10.5-12W
XXL - 11.5-13M
