Known for their durability, Yeti uses (Get ready for some big, fancy words) nigh-invulnerable roto-molded polyethylene and insulates its coolers with 2-3 inches of pressure-injected polyurethane. What does this mean to the lay consumer? The walls of this beefy cooler are think, impenetrable, and unbreakable. Bang it on rocks, drop it down a canyon wall (I have, literally), or throw it in the bed of your truck. It’ll even stand up to a bear’s teeth and claws. This particular cooler’s “bear proof” claim has been put to the test several times in the mountains of Colorado and, perhaps even more impressively, in Montana where Grizzlies abound.