Not sure if you want a floor or not but Clam has rolled out new hubs with a floor option this year. I don't have a Clam but do have a Polar Bird and can tell you that having the floor down makes a big difference in heat. Creates a much more even temp in the shack when you have the floor down. On the flip side, the floor is heavy and makes you less likely to move. Pros and cons depending on how you like to fish.