For added warmth, a layer of fleece (synthetic or wool) worn over your base layers will provide additional protection from the cold during times where you may not be active. From bird-watching to zodiac cruising, an additional layer will provide maximum heat and comfort. Be sure to try them on with your base layers and waterproof pants before packing to ensure a comfortable fit.
Vests and Sweaters
A warm sweater or vest that can easily be removed is the final layer for added warmth. A full-zip vest (down or wool) will keep your body core warm while allowing you to zip open or remove if you get too warm. If wearing a full sweater you may want to consider a quarter zip which allows heat to escape from the chest and neck if you overheat.