Imagine the identical comforts of the X-Pro 100 in a boot with its own built-in heat source, ready to begin pumping out BTU’s from the moment it’s donned. This isn’t some virtual reality future, but a new boot for 2017 with a slightly stronger 110 flex index and an integrated heating unit with a potential 18-hour battery life. The 3-position heating unit dispenses with the goiter-like appendage all after-market heating systems require.