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.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.you warm in cold. If you have any questions, please get in contact withUnisex / both men and womenHeated insoles can keepContains: a pair of 41-46 yards / constant temperature insoles [with 2 4000 mAh lithium batteries]Insole size: length 29cm, forefoot width 10, rear foot width 7cm41-46 yards / constant temperature model [with two 4000 mAh lithium batteries]our dedicated customer service team. We will do our best to help you solve the problem.