I'm going with Asolo fitting and online ordered a pair of Zamberlan Vioz Plus boots at size 10 so I hope they fit. The Vioz looks similar to the Asolo 520s so I don't think the weight will bother me. Hopefully. Online boot choosing is a crap shoot especially with a new brand. Once I get the fit right with Zamberlan then every Zamberlan I get should fit in that size range.