A quick update!
After consulting with Nick at comfortz I now have a rear mattress cover for my 3 seater beach
It's a perfect fit and will help protect the mattress from getting wet and grubby when I am using it down the beach kitesurfing. It will also double up as a great changing area for my 1 year old when I am being a responsible adult and doing grown up stuff!!
It must be your lucky day surfbum I'm just about to write a post about our new offers and clearance page on our website. I'm offering the Beach mattress with over 40% off normally £225 (plain grey covers) on offer at £150.
Check the link out below.
I really want a cover for mine but I've got the 7 seater version so the bench seat is pushed most of the way back normally (with the board articulated) - so it would be more important for me.
I'll just carry on with a cut up karrimat on top until something better turns up.