The new FishMonster or Island Jane 20 oz stainless steel tumblers with hammer lid from Tervis is perfect for a day on the water or on the beach.  These tumblers are made from premium-grade, double-walled stainless steel, and will keep drinks hot for 8 hours, and cold for 24 hours. These tumblers include a push-on lid with a flip-top hammer lid for keeping drinks safe while out on the water.