The king of the trail, adistar Raven Boost, is the go anywhere ''Land Rover'' for your feet. Adaptive Traxion reacts to changes in the ground to provide ultimate feel and transition whatever nature throws at you. Upper: Compression collar prevents trail debris from touching your skin. Midsole: Pro-moderator thin TPU film on the heel for extra stability. Midsole: Boost offers endless energy in the mountains and high adaptability on rocky surfaces. Outsole: Continental rubber mud king inspired lugs for extraordinary grip in muddy conditions. Material: Textile, Rubber, Man Made.