I replaced my genoa sheets with 1/2 inch line that is not comfortable to use and slips on the winch easily and is to large in diameter. That was a mistake. I bought it at West Marine because it was on sale and I guessed at the size while in the store. I cannot find the receipt so I am not sure what kind of line it is. I am thinking about going to 3/8" Samson XLS but will be glad to consider other options. The removed lines were 7/16" with a nice soft outer layer. Nothing wrong with them except the huge knots at the clew that kept catching when tacking. I gave them away so cannot go back to them. 
