There is a about a 1 inch gap at the top, but goes underneath the roof about an inch also. It helps tremendously with dust and wind. My front Super ATV window has a 1 inch gap also, so at driving speed it creates a stream of air that keeps dirt from coming it that area. Any dust I get now comes mostly from under the doors. I went on a 300 mile round trip from Grantsville, Utah To Wendover, Nevada. and only needed goggles through the worst spots with 50 to 75 other machines in front of me.Hey, this seals to the bed you say, how tight is it at the roof? does it keep more dust out than a soft rear I wonder? I have the yamaha rear, i has big vents at the top and does not seal to the bed.