Designed specifically for tight fitting ski, snowboard and riding boots, the Pro Compression Heated Sock is the perfect solution to keep the toes warm all day on the slope or trail. With heat over and under the toes , and extended heat times (4+ hours on the high to 13+ on low), you'll be set for a day on the slope or trail. No more cold toes. Control right from your phone or smart watch, Apple and Android compatible, and now with Siri control!