Read about these knee guards in Web bike world and for the price, they are a good buy. I wanted extra protection for street riding only and these fit reasonably well under my Sliders jeans. I also have Thor knee guards and by comparison, the straps on the Shifts are more comfortable or perhaps less noticeable than the Thors (this may be just my calve size too). The fit and finish appear to be good but I find that the Thors seem to have a little more padding and the knee pad is more contoured so they fit a little better under the jeans than the Shift. Overall, I prefer the Thors but would wear these as well without difficulty. I have fortunately not had to test the durability with anything more than putting them on and taking them off. Neither of these guards will slide out from the leg of the Sliders jeans...you have to unbutton the jean and remove the guards from the "top."
Offers pretty decent coverage of protection from the price. These are not braces of course, but do prevent bashing your knee and shin on rocks and the bike in a fall. My son never complained about them, so to me that means the FIT was very good. I would recommend these, especially in this price range.