I ordered gasket-less goggles which unfortunately weren't right for me, I found them uncomfortable and that they sat too close to my eyes. I recognised this as being my fault and asked Swans if the replacement gaskets would fit. The kind people at Swans confirmed they would not, but offered me an exchange. I now have the FO2 prescription goggles and they are perfect. They don't leak and don't hurt, which is enough for me to be happy with them. The fact that they haven't once fogged up is a bonus, as usually I find most goggles will at least fog a little, but these remain clear for the whole swim. They are also very sleek and look well.