Determining Shoulder Mount Spacing for Your CoolSeat To determine the shoulder mount spaceing of your seat, you will want to measure from the center of the left shoulder strap opening to the center of the right shoulder strap opening. Do this at the bottom edge of the shoulder strap openings, as this is where the top mounts for the CoolSeat will pass to tbe back side of your seat to be secured in place. See the images below for further clarification. Measure the length from the center of one shoulder strap opening to the center of the other shoulder strap opening, at the bottom of the openings. This will place the shoulder mounting straps in the correct location to be secured properly.   This measurement will be too wide, which will place the shoulder mounting straps in the wrong place and your CoolSeat will not be secured properly.   This measurement will be too narrow, which will place the shoulder mounting straps in the wrong place and your CoolSeat will not be secured properly.