SPEEDO "BREATH THERMO" DRY AND WARM Features: Uses MIZUNO's moisture-absorbing and heat-generating material "Breath Thermo." Function: Warms the inside of the clothing by generating heat. Keeps you warm. Even if you sweat, it's not stuffy and maintains a dry and comfortable state. Uses: Rash guards for swimming and marine sports Training wear Or can be used as thermal underwear in cold weather. Unused, but has been stored at home for several years. Please consider if you don't mind.