The only material in this jacket that is windproof (it could probably be waterproof as well) is what you see as black on the collar and upper chest. (see assos.com for confirmation) The rest is thick roubaix material. I believe this item is wrongly labelled as windproof by wiggle. I have this garment and have used it in temperatures around 12 degrees Celsius and the wind goes straight through it. You will be cold without another layer to stop the wind.