Our ‘Everest’ Pet Backpacks are composed of a patented ‘CORDURA’ lightweight material that is Wick proof, Waterproof, Breathable. This Backpack features authentic seat belt material adjusting straps and features a Heavy-Duty DUPONT ‘DURA-FLEX’ Buckle that secures any weight up to 2,500 Lbs. The inner material that lays on the pet is composed of a High-Quality Wick proof Mesh and Suede fabric engineered to gently hug your pet’s body. The zippers on the Backpack are completely Waterproofed. This Backpack also features 3 Reflective stripes on both sides.