Gentle hint for borosilicate double wall glass
1. Do not drop ice into them first. Put the liquid in first when you want to drink inced beverage.
2. Do not use automatic ice dispensers on them. Put the ice in by hand avoid crashing
3. Do not use metal spoons (bamboo teaspoons are hip now anyway) to prevent double wall glass from scratching.
4. Handwash, or if you machine wash, top rack them and leave SPACE around them.