1.4 to 1.5 mm. leather Heel cups, toe caps, ankle protectors, and a leather gearshift pad for structure and durability Brass hooks and branded eyelets, an embossed logo, and off-white stitching for bold contrast Vibram sole provides grip on nearly any surface Goodyear welt construction and triple-stitching for added durability and comfort A rider’s boots aren’t like other people’s boots. They have to be more durable, more comfortable, and built for a lifetime of mountain-pass downshifts.