Damn these are cool! I want to try this really badly but there is no way I’m going to be allowed to get them! 
On a short monetary leash this winter, eh;)
The 17" Blades are appropriate for pretty much anyone with shoe size up to 45 European or 11.5US. You can skate though several inches of snow as well on bumpier ice than with hockey or figure skates. Anyone with frozen lake, canal or large pond access that likes to cross country ski would have a ball with these. One of the cool things about this style skate is that several people can share them as long as their boots have the same binding system since you wear your own cross country ski boots.