I don't know...I've not had a whole lot of trouble wearing wool socks no matter what the temperature. Maybe I have a broken thermostat or something but it's always easier to wear wool than anything else. Cotton, for lots of reasons, is right out. Going camping or fishing...definitely wool...cotton would be absolute folly. Bamboo is getting to be a contender right now and they're doing some nice, thick crew socks out of bamboo rayon...it'd make a great kilt sock material. Thus far, the kilt hose really only look good in wool, synthetic stuff just doesn't look right.

Best

AA