If you're going to run shock cord through it get the 1.5 inch stuff from DIY Gear supply. Or if you're impatient like I was on my last project you can get the 7/8 inch stuff from Walmart - lay two strips one on top of the other and then stitch together along one edge and you've got the necessary width AND it's permanently "folded" which makes it really easy to slip over your UQ edges. (Trying to get the grosgrain to stay folded evenly while you're sewing it on is normally a bit of a hassle)