The Bubble-Poly Insulated Pet Carrier is surrounded by and composed of a High-Grade Polyester Outer shell. This Pet Carrier features a zippered Mesh Entrance and additionally features Mesh Top zippered enclosures. Great for Fall and Winter seasons and can be worn year-round. A bottom cardboard insert is meant to withstand 30 Lbs of weigh. Features accented shoulder straps and a Built-In Leash Holder inside for added protection. This Pet Backpack Bubble is Available in Multiple Colors - Sizing Measurements - (L x W x H) 15.7 x 9.1 x 12.7