The whole idea of fleece and wool is to have to wear a windbreaker over it when you need to. They allows you to take the windbreaker off when you get moving again, and dry out the wool and fleece. You only need one wind layer, and you don't need to wear it all the time. Keeping a 4oz windjacket in your pack allows you to keep your thick insulation layers on while hiking, which saves you pack volume, and allows you to dry the insulation layers out while hiking. Your total clothing system will be alot lighter this way also, because you will be getting more loft per ounce.