Its Solid Base Keeps Ice In Place Sturdy and strong cooler with waterproof hard plastic boot with tread pattern on bottom and gator-mouth opening. Made of 600D polyester. PEVA lined. If you are looking for the ultimate cooler bag, look no further. This cooler combines the best features from both hard-sided and soft-sided coolers. Its upright design makes it as handsome as it is practical, allowing room for 2 liter soda bottles or wine bottles to stand up inside.