I tried it on once, but the size didn't fit, so I'm selling it. Heat Max Inner / Full Inner / HM-inner / AW2_wet Achieves innovative warmth with high-quality brushed material despite being only 0.5mm thick! Made of neoprene, so it can be worn alone, in addition to its role as an inner layer! A wetsuit inner that maintains the best heat retention and dryness. ALL 0.5mm, heat-retaining full inner designed specifically for Japanese people. Doesn't slip and is easy to put on and take off. Water-repellent, heat-retaining brushed type.