A proprietary waterproof, breathable membrane that lets vapor out without letting water in.
A lightweight insulation that keeps you warm. Who knew charcoal bamboo could create something that keeps your feet warm? But it makes KEEN.WARM - a lightweight insulation that provides warmth where you need it most.
Three layers of innovative heat trapping materials get sandwiched under foot to hold warm air in. Works a lot like the insulation in your house.