Ah yes...PF does that too!! These are the Memoform pads . I've got a Heather Moffett backsaver pad (which is also memory foam) and it's a real life saver now PF is all de-muscled!
le mieux (?sp) do a nice (a very nice) one out of derby house. I bought my boy one but so far too nice to use!!!
It has extra foam pads for either front or back and it comes in different colours. Beautiful. xx