A Good nights rest! That is what you and your little one need. Keep your little one from accidentally rolling off the bed while sleeping with Safety 1st Bed Rails. The top-of-mattress design eliminates potentially dangerous gaps between bed and bed rail. It provides a full 8″ of security above the mattress; fitting easily on a twin, full or queen-sized mattress with no loss of height. You can set the bed rail up quickly, just 3 minutes from box to bed with no additional tools required. Once set up, you can confirm with a quick glance at the SecureTech™ indicator that everything is locked into the proper position, and that your little one is ready to drift safely off to dreamland.