Stretchy, form-fitting black underwear. Aqua-Titanium is a material developed by Phiten's proprietary water-soluble metal technology, which disperses titanium at the nano-level in water. Research has suggested effects such as promoting relaxation of mind and body, balancing the autonomic nervous system, and relieving muscle tension (improving stiffness). It is used to support athlete performance and alleviate insomnia. - Brand: Phiten - Color: Black - Size: LL - Material: Polyester, Polyurethane - Features: Stretchy, good fit Thank you for looking.