Midseason slump: They’re stretched out.
How to beat it: Keep sunglasses in a case, not on top of your head (which stretches the frames), and don’t leave them in a hot car (which will warp both the frames and the lenses). You can get a free adjustment from Sunglass Hut (sunglasshut.com for locations), or try your local eyewear shop. Next time look for a pair with flexible-hinge frames (the sales associate can point you in the right direction), which are less likely to stretch. (Want to give a repair a go yourself? Get how-tos here.)