These two types of matting are very similar. The 3M matting is commonly called Miner's Moss. They both have endless loops of rubber filaments perfect for catching and holding fine gold and heavy black sands. It loads up with fine heavies like a sponge and cleans up with a bit of vigorous stretching in a clean up tub full of water.
3M is a bit of a softer, which makes it a lot more flexible. This is nice during clean-up, as it makes it a lot easier to release the sands and gold from in between the rubber.
These two types of matting come by the squared foot. Our miner's moss (green) goes for $7.50/sq.f, and our 3M Nomad Matting (grey) goes for $15.00/sq.f.