The Norrona Falketind Thermo40 Shorts are an insulation piece that is a must have if you are skier that lives in New England (Or any region that is cold a lot) and deals with skiing in sub-zero temperatures more times than not. These insulation shorts can be worn over your existing pants to keep your seat extra dry when its really cold, or keep you dry if you are sitting on wet chair lift seats. The beauty of these shorts is that can be zipped on or off in seconds and compress into a packable pocket on the thigh that you can stuff into your jacket pocket or pack. The main face fabric is a windproof 20D recycled nylon ripstop fabric with PFC-free DWR treatment for additional water resistance. The thermo60 insulation used is a 60g/m2 100% recycled polyester insulation which gives excellent thermal insulation to help the body maintain its temperature, hence minimizing energy loss. If you are looking for a better way to stay extra warm and dry either over or under your existing ski pants, then the Norrona Falketind Thermo40 Shorts are a no brainer purchase.