It is for sleeping at night. Letniss magnetic underwear is not worn at work during the day and is used to improve physical fatigue when sleeping and resting at night. Letniss rotating magnetic underwear is a new type of healthy underwear, which breaks through the traditional functions and is divided into men's underwear and women's underwear by using the best technology. It has the ability to increase nerve conduction speed and muscle contraction, and can relax muscles.