This 4-piece set of boys' underwear is crafted from a soft cotton blend (95% cotton, 5% spandex) with high stretch, providing comfort and breathability for children aged 12 and under. Featuring a flat-legged design with a regular fit, these four-corner bottoms are suitable for all seasons. The knit fabric is decorated with playful cartoon patterns and is easy to care for with machine washing; dry cleaning is not recommended.