DescriptionThis kind of shoe inserts is made of material for durable and long-term use. With material inside, they are available to be charged by USB cable. Perfect to keep feet warm in cold weather. Suitable for both men and women to use for all the shoes.Features- Color: Penoy.- Material: Fiber.- Size 36: About 23×8×0.03cm/9.04×3.14×0.01inch.- Size 37: About 23.5×8.2×0.03cm/9.24×3.22×0.01inch.- Size 38: About 24×8.4×0.03cm/9.43×3.30×0.01inch.- Size 39: About 24.5×8.4×0.03cm/9.63×3.30×0.01inch.- Size 40: About 25×8.6×0.03cm/9.82×3.38×0.01inch.- Size 41: About 25.5×8.8×0.03cm/10.02×3.46×0.01inch.- Size 42: About 26×9×0.03cm/10.22×3.54×0.01inch.- Size 43: About 26.5×9.2×0.03cm/10.41×3.62×0.01inch.- Size 44: About 27×9.4×0.03cm/10.61×3.69×0.01inch.- Size 45: About 27.5×9.6×0.03cm/10.81×3.77×0.01inch.- The right height to keep your feet warm and comfortable.- Rechargeable heating, to solve the winter foot frostbite.- All kinds of power supply can be charged, easy to use.- Wide range of application, all kinds of shoes can be used.- Get rid of the wet winter weather.1 x pair of Insoles1 x USB charger