This 5mm / 3-finger semidry glove is normally a compliment to divers that are exposed to long dives in cold water. When used for sailing, Swete Sailing has noticed that they go from semidry to dry. The Half mitten/half finger design means that they are much warmer (as you have 3 fingers together) yet it still gives you some dexterity. The mitten design coupled with the zip also means that they are easy to 'whip off' in a hurry (especially with the Icebreaker Lining). This 5mm glove was what I used through the Southern Ocean while a single pair of these gloves got me 45000miles around the world.