Calcutta Roto Molded High Performance 30L White Cooler Tough Roto-Molded Thick Skin provide a durable structure for our coolers Fully Filled Premium Insulation Freezer Style Lid Seal to insure that the seal between your lid and the cooler box is maximized. No leaks and loss of cold here folks. Heavy Duty Rubber Latches that are durable and long lasting Traction Lid with Built-in Ruler