USB rechargeable: Heat and recharge the insole via the included USB cable. Accessories: Get a USB heated shoe insole. Adjustable: Cut the insoles to your desired shape by following the printed dotted line guide. Temperature: 40-50 degrees. Winter: Perfect for keeping your feet warm and offering optimum blood circulation during the colder months Options: Choose a pack of one or two. Sizes: Available in small (UK sizes 4-6.5) or large (UK sizes 7-9.5). | USB Heated Shoe Insoles - Black | Wowcher