Gore Bike Wear Fusion Tool SO Jacket. Gore Bike Wear has done it again with the Fusion Tool SO Jacket. The Fusion Tool SO features the WINDSTOPPER Soft Shell system which means weatherproof material on the outside, a layer of legendary Gore tex wind breaking action between, and a layer of fleece on the inside for super warmth close to you. An adjustable fleece lined high collar keeps the wind out, 3 back pockets and zip breast pocket keeps all your necessities on board, and zip underarm vents keep you from heating up too much. This really is the ultimate in XC odyssey gear.