Slips a little
The underside of the mat does not get enough traction against the surface it's on (a desk), and so slips around while using it. This is pretty much the only thing a mouse mat has to do, other than avoid confusing the mouse's optics. It doesn't confuse the mouse's optics, but if you have a slicker surface to place it on you'll need some way of keeping it in place. The mat is a standard size.
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