have gained a Forrunner 310 XT me some time ago, of the standard specification belonging komfortgurt however had a decisive disadvantage in running distances greater than 5km I had always cuts to the chest, in marathons or long distances I had regular two bloody strips, So've searched and read customer reviews at Amazon, then I ordered my predecessor, now have no problems more and also couple that ran without problems, for me the better belt would recommend him anytime
PS'm more of slender shape (186cm and 84kg), the belt thus did not have to cut through the fat