Whether ChiRunning in colder temperatures or crossing a stream with your kayak, the new FiveFingers Flow provides comfortable barefoot protection. A 1.2 mm Neoprene lining and 2 mm EVA footbed provide the thermal insulation and protection. And our new GM50 performance rubber (available only in black) is razor-siped for added slip resistance over a cariety of surfaces. The Flow is best for cold weather running, light trekking, climbing, bouldering, canyoneering, fitness training, martial arts, yoga, pilates, sailing, kayaking, canoeing, surfing, flats fishing.