I just got my sister to start riding and she is a big lady. I found her an OLD (built like a tank) trike. Being a big lady she has fears of the little tiny seat. I saw an ad for a seat that was built around a large metal frame (back and sides) and had a canvas seat stretched over the metal. The seat I saw was maybe 24 to 30 inches wide and 18 to 24 inches front to back. At the time I thought that was neat and if some people saw this they might take the plunge to start biking because the thought of the tiny seats scared them. Unfortunately I don't remember where I saw it and/or who made it. If anyone knows what I'm asking about please send me a link if you would.