The cover of your Burrow Bed is either 65%/35% poly/cotton or 100% fleece.
The pillow cases are poly/cotton broadcloth filled with polyester fibers.
These are individual fibers that simulate the feel of feathers.
They will not lump when washing.
Washing the Cover
Remove pillows and close Velcro (this will avoid lint build-up on the Velcro). Initially machine wash in cold water, and then use warm water with like colors. Tumble dry thoroughly on medium heat.
Re-insert pillows. All cotton beds are either pre-washed and pre-shrunk or made oversized to allow for shrinkage.
Washing the Pillows
Machine wash the pillows on medium or gentle cycle in warm water. Be sure to balance the load, oruse a front-loader. Tumble dry low heat, or air-fluff. Dry the pillows one at a time. Dry thoroughly. Re-fluff the pillows to distribute fibers.