KONG Cozie Ultra uses KONG Ultra-Tex fabric construction, which combines ultra-durable technology that uniquely supports action-packed fun. The ripstop material and reinforced seams are supported with a robust interior liner and is designed to fulfill a dog's natural hunting and chewing instincts. Multiple reinforcements, including heavy duty nylon thread, add strength and durability ensuring that long-lasting fun is supported. Add to that internal squeakers, rattles and dense levels of stuffing and this toy is sure to keep playtime going and going and going.