This is my 6th purchase of these particular GloFX glasses in the last 1.5 years! I've taken these glasses to over 10 festivals and countless shows and people always say it's one of their favorite glasses they've tried. I've had glasses before and a different version of diffractive glasses, but these are by far my favorite. They are ideal for outdoor night festivals (no ambient light) and a light source (stage). When you're far from the stage, everything becomes just amazing! Both girls and boys love them! Girls also like to be photographed with them because they look cute. This is my sixth photo because I always share them at festivals and shows and eventually forget someone is borrowing them. One person dropped them and I broke another pair. Anyone who says they are brittle and not durable does not know the nature of the product. They are of very high quality with thick glass lenses. These are not sunglasses with a lot of plastic and no diffractive plastic lenses. Glass is fragile. And that's a lot. They should also be shared and mistakes happen. So if you are careful with this beautiful accessory and share it with your friends and strangers, you will surely have the coolest prism glasses around at the fair!