"Dynafit, hardboots for people who like to leave the resort"
Koch pioneered a technique where he stops on 60deg terrain, sticks the ice ax, tosses in an ice screw, puts one crampon on his rear foot, and uses the board, crampon and ice axes to down climb glare ice.
At that point its arguably no longer a "snowboard decent", but he's damn more ballsy then me.
He also rides tiny freeride boards, but he doesn't weigh much and carries the damn things very, very far. Oh, and he rides on Burton race plates.