These glasses are medium weight. The swirls at the bottom help with your grip when the glass has condensation on the outside. They are so clear they seem to be made of glass. The blue rim is opaque, not see-through.

Pros: I especially like that the bottoms aren't deeply curved inward, so they drain better after washing.
Cons: I wash them only by hand since dishwasher detergents can quickly etch and damage them.