Bit late with this one, but I have several pairs of the Fast track. Not as robust or as heavy as the original hedgehogs, however I have worn them through a few winters on the Spine race and Coast to coast etc in all conditions including deep snow, flood, mud etc. not a single problem with them, however because of the mileage around 40 a day, I also rep[lace the footbeds with Sorbothane Double Strike. This adds a little weight but for comfort it is well worth it. makes the foot spightly higher at the heel than intended but has coaused no issues for me.