Insole size: length 29cm, forefoot width 10, rear foot width 7cmContains: a pair of 41-46 yards / constant temperature insoles [Equipped with 4 4000 mAh lithium batteries]Can be trimmed the size, and the heated insole thickness same with the sports insole, compatible most of the shoes, suitable for outdoor sports, chores,hunting, hiking,camping,fishing etc.Heated insoles can keepour dedicated customer service team. We will do our best to help you solve the problem.Please check the Size Chart before order. If you are not sure the size, please send message to us. Safety lithium battery PU integrated heating insole, no deformation, no wear, using silicone protective cover, IP45 waterproof design, effectively protect the battery.Unisex / both men and womenyou warm in cold. If you have any questions, please get in contact with41-46 yards / constant temperature model [Equipped with 4 4000 mAh lithium batteries]