Fit is paramount with the Quest Pro 100—starting with an articulated liner designed with Thermoformable inserts around the ankle and heel. 360 Degree Custom Shell technology aims for pressure point-free wrapping of the preshaped high density foam liner through heat molding. The last size can vary from 100 mm to an ample 106 mm. The Hike & Ride feature comes from a magnesium backbone in the rear of the boot and rubber soles add traction for sketchy ridgelines or parking lots.