Marsblade makes a collection of completely unique roller hockey / off-ice frames.
These frames are installed onto a new or old hockey boot and provide a patented rocking motion that is intended to mimic the feel of ice skating. The O1 are a great way to train muscles for hockey when you can't get on the ice. The R1 is better for competing in roller hockey, with larger wheels and slightly less rocking motion.
For any ice player, using Marsblade will make the transition from inline to ice easier.
For roller hockey players, the new R1 frame is legitimately smooth and feels like nothing else on the market.