Ours is a 2020, 38.1
On the 2020 model, the mattress height is 4.5".
As Phyrcooler mention, consider a topper, like
cooling memory foam or latex.
We did a 3" latex topper with cover. Queen size for the V Berth, King size for the
single aft. You will need to cut the toppers to fit, as the size is not exact.
Recommend waiting and test the mattress before making any purchases.
Also if your 38.1 has the
Yanmar SD25 sail drive, be on the lookout for
water in the
oil (seal failure). This can lead to expensive
repairs later.