HuggleFleece® is a soft-as-a-dream, sherpa-like material made of dense, synthetic lambswool and features all the same great attributes of natural lambswool. These mats are conveniently sized to fit our Midwest iCrates, but they make great stand-alone beds too! They are thick enough to cushion joints and breathable enough to regulate body temperature, and light enough to travel with. HuggleFleece® mats are cozy and soft, but tough enough to stand up to lots of wear and washing! (Not meant for chewing though!). Machine wash warm....they don't soak up water so they come out of the washer fresh and almost dry....hang to let air dry.