I've noticed significant differences between various types of foam sold to kayakers for outfitting. Voltec M200 is a particularly good one. One problem is, most sellers of foam don't know what they are selling. I've been impressed by how little information goes with the foam. It is like trying to buy illegal drugs, and wondering about the source: There is no information!! I sell foam, and I'm always looking for a better product and a better price, and it ain't easy!