Ice fishing is hard on feet in a way hiking in the snow is not. You walk out pulling a sled and sweat, then stand or sit still for hours on a slab of ice that pulls heat out through your soles. Slush around the holes soaks anything that is not waterproof to the ankle. A good ice boot has to stay dry, keep insulating while you barely move, and still leave room for a thick wool sock.
There are two kinds worth buying. A neoprene rubber boot like the MUCK Arctic Pro is waterproof from the sole to the calf and slips on in seconds, but you cannot pull the insulation out to dry it. A pac boot like the Sorel 1964 or the Baffin Wolf pairs a rubber bottom with a nylon or leather upper and a removable liner you dry overnight, or swap for a spare. Pick on that first, then on fit, then on the cold rating.
Be careful with that rating. "Comfort rated to -60°F" is the maker's own number, and no maker on this page publishes how it was tested, so treat it as a ranking within one brand rather than a promise. Tom has not tested these boots on the ice. The picks are ranked from what each Amazon listing states, Amazon buyer ratings and AI-assisted research, and no brand paid to be here. The MUCK Arctic Pro has the deepest buyer history, 4.7 stars from 5,299 Amazon ratings.