Posting here merely as I like the forum, though this is general technology.
I spent some time today reading/googling rubber/polymer properties just out of interest. I've been curious about rebound rate in elastomers; the Thudbuster website claims that "The elastomers provide the compression and rebound damping". . . I'm not really aware of any substantial dampening going on and of course it's rebound damping that would be desirable in a cheap and simple system such as the thudbuster. Googling brought up info on a range of polymers with unusual properties, mostly similar to memory foam. . . none of which seemed to have the desirable characteristic of compressing quickly but uncompressing not as quickly. . . instead compression and uncompression rate are tied. . .
And stuff like that. I don't really understand this stuff at all, I'm finding myself wanting to know more.