These fabrics are constructed with nylon making them 6 – 8 times stronger than cottons. They stand up best to repeated washing and wear and maintain their great look and feel for years. Best of all, the microvelvets get softer after every wash. This bed has an award-winning design! The oval outer ring provides a feeling of "security" and comfort for your pet, while the removable "tufted" cushion can be used as a crate or travel mat. Bolster and bottom cushion contain 100% "high-memory" polyester fiber. These beds have zippered covers that can be easily removed for machine wash and dry.