Originally Posted by raftus
Also - High density insulation isn't always better - a vacuum is ideal, and it has 0 density.
Exactly, it is actually the air that provides the insulation, not the foam. The better the foam holds air IN PLACE and doesn't allow it to convect, the better the insulation. But, that said, denser is usually better, but performance is what matters.
Our igloo marine had ice at the take out on an august 7 day lower salmon trip, 95+ degrees, VERY poor cooler management too. No wet towel, just a cover and foil bubble wrap.
Also, I had a cheap wally-world cooler on the grand last april, also 90+ degrees. Ice lasted 10 days. It's all how you make it work. As much as I love my cast iron, fry pans and won't leave home without them, I'd rather not have excessive cooler dead weight in my boat.