How does the mat stay in place without adhesive?

The weight of our Diamond Nitro Rolls helps to keep them in place. Under normal driving conditions found in a garage, these rolls won't move, but if you all of sudden saw Racer X trying to beat you in or out of your garage and you decided to peel out, there would be a chance the roll may move. If this happens a lot, you can just add some double sided tape to your installation or some pressure sensitive adhesive.