Weighing a mere 9.9oz (Mens size 43), the Boulder Boot is arguably the lightest boot in the world. The upper is made of 1200-denier nylon and a durable leather. The whole boot is completely collapsible, great for stuffing into a pack during a hike and wearing around the campfire afterwards. There’s absolutely nothing to this boot, no heel counter, no shank, and nothing stiff that would irritate the foot.