EchoSmile Rotomolded cooler keeps cold for up to 5 days with recommended 2:1 ice-to-contents. The intermediate insulation layer is made of polyurethane so as to provide superior insulative and high strength. The silicone sealing ring seals the whole space to avoid heat convection and prolong the cryopreservation time.Solid rotary mold ice chests and coolers, with classic surface color and natural luster, use LLDPE material, which is safe & environmental-friendly, sturdy & anti-resistant, inside(food grade) and outside(UV resistance).Silicon tension latches do not break easily or come loose automatically. UV inhibitors protect the cooler against sun damage. Anti-slide rubber feet help to keep stable. 2 impact rubber absorbing ergonomic grips on each side help easier moving. The drain plug allows you to remove water without turning the cooler upside down.