Numerous tests have been carried out with the IRBA to test and validate this system. The button integrates a battery indicator to help you better manage the use of the 3 levels of heating of the two batteries Li-on Polymer of 7.4v whose power reaches 2200Ma. In addition to its heating system, the E-COVER combines NEOPRENE and SOFTSHELL to offer a high level of comfort and warmth. E-COVER is equipped with reflective logos and a waterproof zip for easy shoeing. It is compatible with 99 shoes on the market.