600D waterproof, windproof, breathable fabric, coat polishing polyester lining; 100g polyester fiberfill; Adjustable neck closure, belly closure and leg straps to ensure comfort and proper fit; Belly closure is fastened on the inside to keep fellow 'friends' from unfastening; Reflective strips for ease of identification after dark; Adjustable by approximately 4" to accommodate different necks and thickness of girth