An ice shelter is a windbreak you fish inside. Most of them are pop-up hubs: fabric walls on spring poles that snap open on the ice in a minute or two, then fold into a long bag you drag on a sled. The other kind is a flip-over, a sled with a fabric top on a frame that you pull over yourself from the seat. Hubs give room for a group and a heater. Flip-overs pack your gear and the shelter into one load and go up fastest when you move holes every half hour.
The shelter is only half of a warm day. Once you close the door and run a propane heater, you are in a small fabric room with a flame in it, and that is where carbon monoxide comes from. So this page ranks six shelters and then the three things to buy with one: a heater approved for indoor use, a battery CO alarm, and screw-in anchors so the wind cannot take the shelter across the lake.
Tom has not fished from these shelters. The picks are ranked from what each Amazon listing states, Amazon buyer ratings and AI-assisted research. Shelters sell in small numbers, so their rating counts run from 19 to 213, far below the heater and the alarm. A shelter also tells you nothing about the ice under it. Ice strength varies across the same lake, so check current conditions with your state agency or a local bait shop before you go out.