This is the Aqua Lung MK0 Bamboo Base Layer Drysuit Undergarment Dry SuitFeatures: Breathable, moisture wicking, Bamboo blended material. Antimicrobial Odor resistant Easy care This one piece, bamboo fiber base layer, is ideal under any of our undergarments for excellent moisture wicking performance. The MK0 can also be worn as a stand alone layer in tropical conditions.