Well, I have a Performance-branded set that I bought from Performance Bike years back, but I don't remember exactly what model name or number, and it looks likely that they're not still offering this exact model. This booty has a zipper in the back and a rubberized sole, and says "14" on the bottom, but the current line of Performance Neo Booties (http://www.performancebike.com/bikes//Product_10052_10551_1082829_-1___#ReviewHeader) says that it uses a Velcro closure and comes in sizes S/M/L/XL. Also, one of the reviews says "the old model with the zipper worked better". :-/