... in shoe heater is custom made for the manufacturer, Industool,by a Swedish company specializing in such products. This Swedish firm provides heating systems for heated car side mirrors and snowmobile hand grips , so you know this is a well made product.

Exterior of insole is polyester with an embedded ,wafer-thin, electric brass heating grid. Shock proof, it's powered by two AA batteries per insole. Battery pack securely attaches to calf or ankle with the provided strap. Has a 12 inch power cord and may be worn inside or outside of pant leg. Used like an insole, place heated insole between sock foot and inside of shoe or boot. Cozy Feet insoles reach a temperature just below that of body temperature, approx. 98 degrees.

What to expect? The heated insoles are electronic, powered by 2 AA batteries and are intended to take the chill off, so it's not realistic to expect strikingly noticeable heat - they won't make feet become hot. Rather they maintain a temperature of an approximate body heat of 98 degrees, so when normal blood flow won't keep toes warm Cozy insoles will make up the difference keeping feet warm when you need it. Each pair of batteries are estimated to keep feet warm for 5-6 hours.

Long lasting, it won't lose effectiveness like microwaveable or reactive chemical heating elements. Package of two heats one pair of footwear and great for use in mittens too. Cozy Feet are ideal for diabetics and other persons suffering from poor circulation thus cold extremities

Indstool themselves are no stranger to quality personal heating items. They're makers of a complete line of proven and well established heating mats and space heaters and have extensively tested this product for quality and durability.