Ribbon collars are made from high-tensile strength nylon webbing with sewn on polyester/nylon ribbons. Our ribbons are stain and fray resistant; designed to last a lifetime. All collar and lead hardware is cast, not welded brass for extra strength. Our buckles are Coast Guard approved for high weight hold. Machine wash cold, air dry. SIZING: XS (6-12”); Narrow 5/8” S (9-15”); Narrow 5/8” S (9-15”); Wide 1” M (12-18”); Narrow 5/8 “ M (12-18”); Wide 1” L (15-21”); Wide 1” XL (18-24”); Wide 1” XXL (21-27”); Wide 1”