I purchased these as an accessory to my Luna Lovegood costume for Halloween, and they were a hit. I've worn them around campus before instead of sunglasses, and even people who don't know much about Harry Potter think that they're really fun. I took them with me to the theater when I saw The Deathly Hallows, and I forgot that they were in my bag and they stayed there for a few days. Sadly, being loose in my bag allowed other items to brush against the lenses and the design on the lenses has started to rub off. If you were to keep them in some kind of protective case, I'm sure they would be fine. Overall, they are a great addition to any costume and are pretty durable.