With a wearable device that attaches right to your boot, Carv is offering the most personalized ski coaching there is. The unique training system puts 36 pressure sensors and a motion sensor on each foot to track balance, edging, turns, and pressure. As you head down the slopes, it evaluates your performance and sends real-time feedback to improve your technique through an accompanying app. The device comes in the form of a boot insert and slides underneath the linter of your boot. Its battery pack clips to the strap of your boot and provides enough charge to keep you on the slopes for three days.