1)We take rotational moulding technology ensure impact resistance and excellent durability. 2)Outer material takes LLDPE,have the great performance in UV resistance. Middle material uses PU form,guarantee the high-performance in insulation.Thus our cooler box can Keep warm or cold at least 5 days!!! Inner material choose food grade PE,free from extraneous outdoor corrosion-resistant.Safety and reliable. 3)One-piece, seamless construction, have no seams to fail, leak-proof 4)The scale on the surface can help you measure the fish or anything else you want. 5)With cup holder design, each size have cup saucers on the upper can help you place your cup and ensure them will not dump easily. 6)Durable sealing gasket is make sure the box excellent leakproofness. 7)The stainless steel lock plays a role not only as a lock but also as a bottle opener. 8)Adjustable handle rope will bring you comfortable feeling when carrying them. 9)Drain valve design with recessed drain plug could let the melted ice flows out easily.