The difference is inside.
The Hypro-Loft filling, an exclusive blend of virgin and recycled materials, provides unsurpassed loft retention--meaning your pet stays comfortable longer. Won't shift or mat, even after washing or extended use.
Entirely machine washable.
Cover has 100% cotton top with nylon pack cloth bottom.
Washing Instructions
Hypro-Loft Filled Liners: This specially-engineered fiber was designed to be completely machine washable in cold water. It should also be machine dried using low heat. The manufacturer suggests removing the cover before washing the inner bag.
The manufacturer recommends that the following inner liners be washed in a commercial washer only because of their excessive size: 42" round, 52" round, 36" x 48" max.
Covers: Wash inside out in cold water. Tumble dry on low heat or line dry. Warm iron.