Therm-ic Basic with Perform insoles features....

• Can be used world wide with AA battery power!

• The Perform insoles already have the heating elements built in. All you need to do is remove your current insoles, trim to size, install in boots, plug in and turn on. Fits all types of winter boots.

• Impulse Control- The warmth is transferred from the battery pack to the heating elements by impulses which deliver more energy than a constant power on used with other brands.

• Comfortable warmth up to 12 hours with fresh alkaline AA batteries (not included).

3 heat settings

• Setting #1: 37C/99F and lasts 12 hours.

• Setting #2: 45C/113F and lasts 5.5 hours.

• Setting #3: 70C/158F and lasts 2 hours.

• Results are based on fresh AA Alkaline batteries. Expect about 10-20% less results when you use rechargeable or disposable batteries. Keep in mind, you don't have the heat on all the time, only when you need it. For instance, you turn the power off when you go inside for lunch or if you are not cold.

You'll receive

• Instruction booklet on how to use.

• 2 battery housings that hold 4- AA batteries each and clip on the back of a boot.

• 2 Perform insoles which are anatomic 3D shaped insoles with connecting wires. The Perform insoles give great support for stability and balance. They are made of high quality EVA foam. The heating elements are built into the toe area of the insole so all you need to do is remove your current insoles, trim the Perform insoles to the same size and slide the Perform insoles in. You can opt to run the wire for the battery right up the back or put a small slit in your boot liners and run the wire between the liner and shell. (We recommend the later.) It took us less than 30 minutes to install.

• Battery specs- weight with 4 batteries- 5.3 ounces, size- 3" high x 2 3/4" wide x 1" deep.

• Therm-ic offers a 1 year manufactures warranty against any defects.

Perform insole sizing

• X-SMALL- Mondo 22.0-23.0, US men 3-4, US ladies 5.5-6.5, UK 36-37

• SMALL- Mondo 23.5-24.5, US men 5-6, US ladies 7-8, UK 38-39

• MEDIUM- Mondo 25.0-26.5, US men 7-8, US ladies 8.5-10, UK 40-42

• LARGE- Mondo 27.0-28.0, US men 9-10, US ladies 10.5-11.5, UK 43-44

• X-LARGE- Mondo 28.5-29.5, US men 11-12, UK 45-46

• XX-LARGE- Mondo 30.0-31.0, US men 13-14, UK 46-47