Winter cycling gloves are designed to keep your hands warm, windproof gloves are especially good at this as they stop the winds chill f
rom reaching your fingers. Many models incorporate a waterproof membrane to prevent the insulation layer getting wet, this is important as water carries the cold quickly. They are shaped so they're comfortable in the usual riding position and the fingers are usually pre-curved. If your riding position puts a lot of weight on your hands, choose gloves with padded palms, some even feature gel inserts for additional comfort and shock absorption.
Alternatively, wear your summer cycling gloves underneath a slightly larger pair of insulated winter gloves.