The Lys collection, named after the Lys River for its clarity, pure simplicity, utility and beauty— all shared characteristics of the river that runs through France and Belgium. These tumblers are the perfect kind to use every day for any purpose! They are equally suitable for cold or hot drinks, conveniently stackable, impact and chip resistant, microwave and dishwasher safe. Duralex is and will always remain a true French manufacturer of glassware and tabletop products, and is the only glass manufacturer who makes 100% of their products in France.