Very popular as a baby-shower gift for parents who practice any type of martial arts; MMA, judo, karate, tae-kwondo, to name a few. The belts come in 2 sizes and are adjustable. They fit ages 0-6 years and are a perfect match for the Baby gi outfit. The knot is already tied and sewn onto the belt, so it stays in place. The belts meet international safety standards in baby & children’s clothing. The fabric is soft cotton and the belts can be machine washed.