Hiya Keyman13, thanks for your question! This boot has 200 grams of insulation, which is roughly equivalent to a pair of thick wool socks added to your shoe. This boot would be fine for high activity levels. For very cold temperatures and low activiy levels, you might want to select a boot with 400 grams, like the Timberland Men's Chillberg Premium Waterproof Insulated Boot. http://www.moosejaw.com/moosejaw/shop/product_Timberland-Men-s-Chillberg-Premium-Waterproof-Insulated-Boot_10227058_10208_10000001_-1_
Hope this helps!
Date published: 2017-01-01