Children and older children have different physical and physiological characteristics, so do boys' underwear. According to the explanation of children's wear experts, the figure and physiological development of children and older children are different, so designers will consider these factors when designing boys' underwear, including size, waist circumference, hip circumference, material and so on. Comfort and breathability should be considered in children's underwear to adapt to an active lifestyle and delicate skin; Such as the development, movement and protection of male reproductive organs.