Temple garments are special clothing that some people who follow the Mormon religion wear. They are undergarments that are designed to remind people of their religious promises and commitments. They are worn all the time, day and night, except when showering or swimming.
The garments are made of a special fabric that is meant to be comfortable and breathable, so that people can wear them for a long time without feeling too hot or uncomfortable. They come in different styles for men and women, but they usually have short sleeves and reach down to the knee. They are not meant to be seen by anyone else but the person wearing them and their spouse, so they are worn underneath regular clothing.
The reasons why people wear temple garments are personal and different for everyone, but some of the reasons include feeling closer to God, feeling protected, and being reminded of their religious commitment. They are not mandatory for all Mormons to wear, but many choose to do so as a way to strengthen their faith and receive blessings.