Oiled Ecco nubuck leather, used as a single piece, forms the entire upper of the Bedrock Mountain Clog. With no lining layer between hide and foot, the unlined leather stays supple against the skin and holds up to repeated wear. What Our Gearhead(R) Experts Are Saying:"Shallow creek crossings and muddy trailheads haven't bothered the leather on my pair. A brush clears the dirt at camp, and the few water marks that stayed just add character. I oil them about twice a year to keep the nubuck supple."