I saw these and thought wow finally someone invented a holder for your glasses!  I love the concept but they don't work well with sunglasses.  If i bend over, my glasses fall right out.  Maybe a sport readrest with some type of rubberized holder?  I've already lost a set, my fave too (crystals)  when I hugged my friend the front piece must have fallen off.  Customer service is wonderful, had a pricing issue, contacted the company. The owner who is a really nice guy, understood my concern and sent me 2 pairs of these!  Very nice people!  SPORTRest!!