There are a lot of different styles of rescue track devices out there. This is our version that we make in house. We added stainless studs on the lead edge for starts on ice. The other great feature is that ours are flexible and can fit in a smaller area. They are designed to nest together. These aren't going work if you want to make a bridge or need a ramp. They will however get you unstuck in sand, mud, snow & ice. Best part is the low price.