I am only selecting the above picture to make a point, not to put down the top itself, and pointing out a "problem" of the majority of the tops designed for the Slingshot, where look at the sun shining on the seats? The time most of the tops are effective in protecting the rider(s) is only when it is directly overhead, otherwise, at least one of the riders is typically in the sun.
Bill
you will not get complete protection, even in a car unless you tint the windows. Is it much better protection from the sun than without the top? Absolutely!!