I wear the mediums, personally. Best socks I have ever worn.
If you're not sure, order from REI. Try each, return them. Insanely generous return policy.
As of this writing, the mediums are on closeout at REI for $10.93 a pair.
Last edited by sangsters; 10-29-2012 at 08:50 AM.
Reason: deal on REI.com