This is the Aqua Lung MK2 John Drysuit Undergarment Dry Suit Layer Features: Zippered chest and hand pockets on John. Removable sleeves on John. Front and rear relief zipper on John. Ankle straps on John. Thumb loops on John & Jacket. Materials: Breathable, moisture wicking, high loft, insulating polypropylene Polar Fleece lining. StormProof 70 denier micro-ripstop water resistant Taslon nylon. The Aqua Lung MK2 Undergarment is the core of the Glacier series undergarments. Extremely versatile, these garments can be layered up or down to match the widest range of diving conditions. Stylish and feature rich, the MK2 jacket coverts to a vest to be worn as added thermal protection with the MK2 john.