I wear the wetland boot, which has a bit less insulation and is geared more towards warmer weather hunting. That said I have worn this boot with temps down in the 30's without any problems. I just use a wicking type sock, then a heavy wool sock. Much boots are great. Warm, comfortable, not overly heavy and waterproof. I can't say how they will do in super cold conditions but I don't think you will go wrong buying a pair.