This collection is named after the Lys River because of its clarity, simplicity, utility and beauty—all characteristics of the river that runs through France and Belgium. A terrific set to use every day, these glasses are tempered. They are equally suitable for cold or hot food, 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.