Northern Diver Scuba Diving Thermalux Undersuit size MLR. (see size guide photo 9). This suit offers a lightweight 1kg approx. Streamlined solution to keeping warm. Superb insulation and flexibility, completed with a breathable microfibre outer and is quick drying. The undersuit has warmth retaining panels in the lower back, shoulders, cuffs, lower legs. Hand thumb and foot stirrups.