Like the removable pillow that sits lower in the bed and the 2 sided pillow.  One side is plush and the other is polyester which keeps a cooler feel. I originally bought the medium size for my cat, but she didn't like it, even though she can fit in it.  She prefers a larger bed, since her recent house guest had a much larger bed that I couldn't keep her out of it.  I ordered the xl size for the spoiled cat and it should arrive any day.  My yorkie likes the medium size bed, so both pets will be happy.