The glass design enables one to hold the glass very easily and the double wall design keeps cold beverages cooler longer and warm beverages warmer longer. The only downfall is they are easily broken in dishwasher if not separated from other dishes.
VERY FRAGILE and easy to break. I know they are "GLASS" but there has to be SOME strength to them... I put one down in the sink and it shattered. I bought three sets and have 1 glass left. VERY DISAPPOINTING for the price! I seriously thought it would be better quality