I have synthetics but generally switch to wool if it's below freezing and add gaiters if there's more than a couple inches of snow on the ground. If it is precipitating or there's snow stuck to the brush or it's windy I add lightweight soft shell rain pants over wool to prevent snow from sticking to wool & saturating/freezing on lower legs.

Better to do it when you're young so you can talk about it when you're too old than talk about it when you're young and do it when you're too old.

www.clarkforkoutfitters.com