These safety glasses were less than ten dollars, and it quite a good value. I wanted a pair of safety glasses which I could wear while using power-tools, lawn equipment, and general home repairs (such as looking up under the sink, or in the attic with dust & fiberglass). So I recently purchased a prescription pair of glasses which were very similar (glasses with a strap, nose/bridge foam, etc), and that came out to over $438 (The frames alone were $260). If I had known about this set of glasses, I could've saved enough money for two years of contacts lenses; and got similar functionality. While these aren't prescription, they do offer an excellent field of view (big lens), and wide enough strap for an XL sized head. I think paired with contacts, this would prob be 90% equivalent to the prescription set I purchased (this did not come with a case though). These are very affordable, comes with a lot of color & tint choices, fits very large heads, strap to keep the glasses from moving/falling off your head, and has some foam around the frame which prevents dust and dirt getting into your eyes. I have not tested if the lens scratch easily or not, but for less than ten bucks, I can buy several sets. and still come out ahead. I highly recommend this product, if you are looking for a pair of safety glasses with a strap. I liked these so much, I bought a second pair (and thus, I wrote two reviews)!