Review on JELINDA Adjustable Elastic Shirt Stays For Men - Non-Slip Shirt Holder With Locking Clamps - Ideal For Police And Military Uniforms by Matthew Nielsen

It keeps your shirt tucked in. It's as simple as that. I worked as an after school teacher and would occasionally play with the children. As others have said, this is not for playing around in. Mine haven't broken in the time that I had it, but they will move around and permanently loosen the holds on the straps if you don't take care of them. I've played kickball with them and they're still usable, so I'm going to say these are good quality and worth the buy to look professional and clean.