For trips in the off-season when it's too cold for a singlet and too hot for a full jacket The Castelli Fly Jack-sey model is suitable for us. Fly Jack-sey made of Castelli Fly SL shell for protection against rain and wind and insulated with CLIMA SL synthetic filling easy warm and comfortable. The GORE-TEX WINDSTOPPER inner lining adds even more warmth and comfort and keeps the wind from ruining our warmth. Three rear pockets and a zippered security pocket keep everything you need close to your body. while the elastic bottom with silicone grip helps keep the Jack-sey in place.