These shirt stays are the best I've ever owned. On patrol, I've tried a few of the different styles, but getting in and out of my patrol car, squatting, bending, kneeling, etc. always seemed to get the other shirt stays with the plastic or rubber clamps to 'pop' off of my shirt and then you have that annoying distraction of the stays grabbing and bouncing off your leg. These metal clamps even have a pin in them that clamps through the shirt and I've yet to experience them coming loose from my shirt (and I wear them really right to keep my shirt pulled in very tight). The only reason I rate these as a 4 out of 5 and not a perfect 5 is because I feel the stitching at the bottom of the stirrup could be of a better/heavier quality. In the 6months I had the first pair, I managed to have one stirrups' stitching rip at the bottom. Other than that, awesome product and the best shirt stays I've ever come across...