I feel quite mislead on the underlay I purchased. The images for both the 10mm and the 10mm are the same. The reason I purchased this underlay was I was lead to believe (through the images) there would be a dual layer of foam - white and blue. This isn't the case with the 10mm, which now makes me doubt it's softness and drainage under foot if a heavy rain came or during winter. I also had a dog so that double layer I hoped would deal with any of his pee. Really not happy it's so misleading for a premium product. I could have got the same on eBay. It's foam with slits in it.