As I have gotten older, Myself no shelter, I had a two man I loved, Had some room in it, then it got to heavy for me, then I went to a clam one man fip, it drove me nuts, NO ROOM, I felt like I was in a bag, I really could not breath in it. and it had no room to fish and use my flasher, and if I lit my heater, Will anyways, That's just me guys. So when you see an older guy sitting in a clam cooler chair dressed to stay warm. And I have to say, the right clothes work. Never been cold, I feel better sitting on the ice. That's just me.