They are not cold weather boots, they are mid range! I always wear a minimum 400gram boot all of Sept & Oct hunts. One boot will do it all unless there's some severe weather hitting, then heat pacs put in-between two socks will help you out! Many hunters think 400grams is serious insulation, it is not, it is very minimal. I still wear two pair of socks in my crispi gtx hunters at 10" tall & 400gram, no problems at all with 80deg temps & up to 15miles a day!