Based on the specs and the beds we already had I bought 3. The cover is nice - but there in NO way these are 3.5" thick. They have one layer of egg crate, vey thin and for my 65lb dog provide little to no support. I would NOT recommend these.
Lasts about 3 washings for the covers, zippers come apart, and foam is substandard. Compresses flat quickly
What a RIP-OFF!!!
Not at all what I expected . . . overpriced for what it is . . . very poor quality . . . Costco and regular pet stores offer MUCH better in the same price range!!!