The Hotronic S4 power plus Heating Element is a high-quality foot warmer designed for winter sports enthusiasts. Made in Switzerland by the reputable brand Hotronic, this element is from 2.7 plus new custom set and fully compatible with the S/E/M Series. Perfect for keeping your feet warm and cozy during skiing, snowboarding, or snowshoeing adventures, this heating element is a must-have accessory for staying comfortable in cold weather conditions. I tested this element and it works well.