ENGEL, the original high-performance cooler, is roto-molded for toughness and durability. It’s filled with a full 2 inches of insulation in the lid, on the sides, and on the bottom, helping to retain cold and ice for up to 10 days. The all silicone gaskets create a near airtight seal that is durable and will never lose it's shape. can count on the ENGEL 35 High-Performance Roto-Molded Cooler to keep your favorite beverages nice and cool.