This is a lifesaver for winter diving. AQUALUNG black innerwear, size M. - Brand: AQUALUNG - Size: M - Color: Black Thank you for viewing. It can be worn as underwear with both drysuits and wetsuits, supporting body warmth during diving, and in warmer regions, it can be worn as is for diving. The material uses high-tech, high-quality fabric, applying ceramic technology to a 3-layer structure to achieve high heat retention, zero buoyancy, and the best comfort. It uses Lycra on the outside, and a material that combines highly breathable polyurethane (PU) membrane and polar fleece on the inside. Purchased new online for 18,000 yen, tried on once at home, then home cleaned and stored at home. It was a little tight for me, so I am selling it.