Discovered an easy solution for those of us who wear glasses while playing baddy. You know, when you're sweaty and the glasses keep slipping down the nose... Instead of tying it at the back with an elastic, I've used an elastic band to loop around each of the part that goes above the ears. Just keep looping until there is no slack left and there is a thick nubbin of elastic built-up. Put on your glasses, and voila! Instant non-slip glasses! And did not cost even one cent!