A 59-in span covers the length a toddler actually rolls across, and the base presses down onto the mattress so no gap opens between the rail and the bed where an arm or a leg could slip through. Four height settings run 31.5-in to 37-in and suit mattresses from 2-in to 9-in thick, which covers a slatted frame, a platform bed, or a recessed bed deck. The panel lifts vertically behind a double child lock, and the zippered cover comes off for the washer and dryer.