Slumber Pet Fleece Beds Provide Greater Resting Comfort. Unique bumper style crate mat combines thick fleece and bumper-style cushioning. Bed dimensions are slightly larger than ProSelect Crate dimensions so the bumpers are supported by the crate, softening crate's edges and providing an inviting nestling area for dogs. High-quality fleece stays cool in the summer, holds heat in the winter, and is completely machine washable. Slumber Pet Fleece Beds are available in the sizes below designed to fit most crates.