Merlin Sierra D3O Explorer Boots Sierra D3O Explorer boot blends premium leather with durable scratch rubber, resulting in a lightweight, comfortable, and highly durable mid-height fit. Notably, Sierra stands out with its innovative ratchet closure system for precise adjustments and the inclusion of D3O's shock-absorbing impact protection, guaranteeing top-notch performance and safety. Construction: Premium Brushed Leather Upper Reinforced Scratch Rubber Panels Ballistic, Padded Nylon Collar and Tongue Panels Vibram High Grip Sole Comfort Mesh Inner Lining High Density Nylon Panels Pull Tabs Waterproofing: Hipora Waterproof and Breathable Membrane Protection: D3O Shock Absorbing Impact Protectors Reinforced Footbed Gear Change Overlay CE Certified Fit: Micro-adjustable Precision Fit Ratchet Fitting Antibacterial Sole Insert