The Mammut Cypress GTX is a superlight boot that has been made using a combination of Nubuck leather & air mesh fabrics. It features the waterproof & breathable protection of a GORE-TEX lining, & the lightweight traction & durability of a Vibram sole with Mammut's Frog grip technology. It also has Mammut's Rolling Concept & DC footbed for exceptional comfort, cushioning & stability while backpacking or walking. Glossary: GORE-TEX: An extremely waterproof, breathable & durable membrane laminated onto fabrics Vibram: High quality rubber soles that are renowned for durability & stability on all surfaces & in any environment Rolling Concept: Stabilizes the inside edge of the heel & outer edge of the midfoot, & cushions the outer edge of the heel & inside edges of the midfoot & forefoot DC Footbed: Dual heel section, open-pored PU foam with active carbon & textile layer provide damping & climate control