420D Nylon Children Chest Waders are specially designed for children and are made of high-strength 420D nylon material. "420D nylon" refers to nylon materials with a fiber density of 420D. Compared with lower-density nylon materials, this material has higher strength and wear resistance, can withstand greater tension and friction, and is also lighter and softer. Good water resistance. Compared with some PVC materials, nylon materials are generally more environmentally friendly during manufacturing and processing, reducing the negative impact on the environment. Nylon has high softness and can better fit the curves of the body, providing a more comfortable fit for your child. Wearing these chest-high waders, you can safely let your children engage in water activities without worrying about them getting wet from the cold water and getting sick.