Properties of breathable glasses: a wine poured into a breathable glass for just 2 to 4 minutes will show signs of aeration equivalent to the same wine that has been decanted and aerated for 1 to 2 hours. The original character and structure of the wine are preserved, yet the wines aroma and palate impression become more open and generous. The properties of breathable glasses were confirmed by wine professionals all over the world and Eisch also received innovation awards from Germany and Canada. The breathable glasses are made in Germany. In addition to wine, breathable glasses can also lead to improvements with spirits, fruit juices, and mineral water. Manufacturing technology: breathable glasses are made from lead-free crystal-glass. After the actual manufacturing process, the glasses undergo an oxygenising treatment which gives the breathable glasses its unique properties. The breathable glasses of the "superior" line are produced with the latest pulled stem technology, that means that they are made out of one part and due to this they are very break resistant. Cleaning instructions: the breathable glass does not lose its effectiveness-ever. It also does not have any special cleaning requirements. Wash it as you would other quality crystal glass. The glasses are dishwasher proof. Glashutte valentin Eisch: the Eisch glass factory is located in Bavaria, Germany and is a family business since 1946. Due to its high quality in production and design and its innovations Eisch has been voted eleven times number one glass producer by german retailers since 1995.