Simple easy way to keep prying eyes and hands out of the bed of your truck. Insalls very easily with no drilling or measuring. Simply lay out the rails and clamp them into place. The vinyl cover has three ribs, and rolls out effortlessly and evenly from either side. Once snapped down at the tailgate, the whole thing pulls snuggly and locks securely. It can only be opened once your tailgate is down, as the release is underneath. If you plan to haul something, simply roll it back like a bed sheet, and secure it against your cab out of the way.I liked this design and simplicity so much, I sold my over the rails toolbox (in the pic sitting sideways in the bed) on fb marketplace and bought a used trunk style box that fits below the rails. When all was said and done, I ended up with more storage space in the box, and entire bed worth of space that can now be secured under the cover, and even made $20 on the tool box swap.Something worth noting. When you roll out the cover and secure it to the tailgate end, it will fall into place and secure to the rails via Velcro as it stretches out lengthwise. However, I would also then suggest pulling with your fingers from either side, then pushing down on the Velcro to get a good solid stretch widthwise. The first night I did not do this, and we got over 2" of rain. As you can see, puddles collected and I noticed it flapping at highway speeds (see pic and video). However, if you stretch out the cover sideways to the two Velcro's sides, you won't have this issue.In summary this is a very affordable way to secure your belongings but still allow full functionality of your bed when you need it. Rolling open or closed literally takes 30 seconds, and this thing stores out of the way very nicely. Great product.