Thanks, they have 4" raised wooden beds at the back of their pens, during the summer they only have sawdust down because they either kick the straw off or lay on the concrete, but I'd like something softer to put on the boards, I had hoped to get the pens rebuilt and raised concrete plinths at the back, with a very slight slope to the front, again with removable wood, but doesn't look like it will happen this year. As they are in more as the nights get longer i'm looking at other options.
The ones on ebay I've been looking at seem suspiciously cheap up to the website options (Eva). But they do say they are about 35mm thick and good insulation.
If they have the bumps and stripes I'll remember that JJ :-), do they do it for a joke?