Large Rebound Foam Insert + Base (no top cover)Got an existing ambient lounge dog bed? Upgrade your dog bed by changing the base from bead to rebound foam! Get a special discount by sending us your previous order number & a photo of your ambient lounge dog bed. Note: You cannot insert the foam mattress in the dog bed base that is designed for bean filling. Designed for ultimate support and relaxation: Made with 70% high density orthopedic foam Combined with 30% memory foam Provides excellent