Jaydubblazer is right- the double wall is seamed down the middle, so it can have a tendency to bow thru the middle. The double wall tops are nice tho because they help cut down on the condensation on the interior of the blazer. Also the dblwall has the bolting hardware inside hidden from view so it is a little cleaner look. All in all I think the singlewall is probably the better of the two. That is why this top isn't worth too much. Is anyone interested in buying it? How about $50??? I would just like to have it out of my yard