Father's Day Gift Beer Bottle Coolie Best Grandpa Ever 2 Pack Bottle Drink Coolers Coolies Navy A funny Father's Day gift for Grandpa The perfect Grandpa gift for any occasion. Fits most types of 12oz longneck bottles. Zips open for easy use. Machine washable. Premium 1/8" thick high density open cell polyurethane foam keeps beverages cool. Coolies make a great gift or party favor. They are a momento with purpose!