These are durable, relatively inexpensive glasses which I use for outdoor activities. They take a moderate amount of abuse well. Several times, I have forgotten that they were on my jogging cap brim and dropped them to the ground and the lenses have resisted major dings and nicks so far - after 6 months, how much more can I ask? Even when they take a real hit, one forceful enough to make a lens fall out of the rim, it is quickly and easily re-seated.<br /><br />One thing I have noticed is that there is a coating on the rims which gives the plastic a matte finish and it has started to peel off on both sides inside by my eyebrows. Since it is only visible on the inside and I don't really care how these look while I am exercising, I am able to ignore the aesthetics and get on with life.