Has anyone designed a "top" to protect you from the sun? I started thinking about this from the thread on sunscreen. I am imagining something attached to the rear hoops (able to remove) it would swing down over your head after you were in. Then 2 pins to hold it down. I am thinking of just fabric over the top. Nothing fancy. Really hard to explain without a picture. Like the picture in the link below but without any support from the front.

http://farm2.staticflickr.com/1011/988722092_2c7d8b41b3_z.jpg?zz=1