We've taken pet beds “10 steps” further and used a waterproof fabric on the inside which is stitched down just like the normal donuts.
Why waterproofing? Odours, parasites and fleas will not be an issue.
The bed comes with a removable zip-up cover. This low-maintenance bed is easy to wash as you just put the removable cover in the wash instead of washing an entire bed. All donut covers are made from a durable fabric and comes in various fabric combinations. 
 
Dimensions
SMALL 55CM DIA  
MEDIUM 85CM DIA
LARGE 95CM DIA
EXTRA LARGE 120CM DIA