As with all Thirtytwo boots, the Ultralight comes with heat moldable liners who gives you the custom fit you want. This is the lightest snowboarding boot on the market using full Evolution Foam out sole and the Polyurethane Exoskeleton that gives you a lot of support on the outside. The inside liner has got breathing holes that reduces weight but also give your feet breathability. The 3D molded tongue and the Inner Ankle Harness will keep your feet supported and comfortable in the boot. The Ultralight is a little bit stiffer this year.