When the time comes, it's easy to replace the fill in your dog's bed. This extremely durable bed fill is covered by a strong, breathable, airmesh material that will not retain moisture or odor. The inner cushion is channeled to prevent clumping and shifting, a technique that keeps proper support throughout the bed. It is filled with a high-loft, recycled, polyester fiber to create an incredibly comfortable, mattress-like bed. The sewn in chambers maintain balance and even distribution of comfort.