ProFLEX offers more comfort and ease of use than the original heated insoles utilizing a flexible polyurethane insole material a comfortable Poron battery cover cushion and a removable rechargeable battery. Plus these insoles offer convenient remote operation and a minimum of 2500 hours of use about four winters of heavy use. Package includes: 2 Heated Insoles 2 rechargeable batteries 1 remote control with battery 1 battery wall charger 1 USB cable 1 instruction booklet. Keeps feet warm not hot 3 temperature settings: No heat (standby) Medium (100 degrees F) High 111 degreesF) Rechargeable foot warmer Recharges in 4 hours using wall charger or any USB port Recharges at least 500 times Wireless remote control Antimicrobial shock absorbing Poron cushion batter cover Can be trimmed to fit almost any shoe size Water-resistant Easily fits into your shoes or boots Easy to recharge batteries without removing insoles from shoes