They are suppose to add around 300# of extra flotation, I'll test that out in the summer months. They have a couple special lug nuts and then just 2 long bolts and a metal plate. On the bolts is a nut to sandwich it against the tire. They are surprising very sturdy on there. I was driving up on downed trees with them and they didn't move at all.
I took them for a short ride yesterday and they do help as long as you keep moving. If you stop in deep snow it tries to dig down when you take off. The snow we have isn't the greatest for testing though, 2-3 inch crust and just very fine powder under that. I think in wet snow it would be a different story and I'm hoping we get some to test it out in. I noticed pulling a trailer through the snow it did it a lot easier with the added traction. They are in no way tracks but an alternative if all you need is just that little extra. I have to order the lug nuts or build a set so I can test them out on a Pioneer and see how they do with the extra weight of the machine. My video camera was dead and I forgot the phone in the house but when i go play again with them I'll try to get some video.