These Dharco youth mountain bike pants are perfect for young riders. To use them, simply put them on like regular pants. They're great for mountain biking, so wear them when you hit the trails. When it comes to sizing, if you're similar to our model, a Youth 10 would fit well. Remember, these pants have space for knee pads, so you can add extra protection. Also, there are three pockets where you can keep small essentials like your keys or energy bars. As for maintenance, they're made of quick - drying fabric. So after a ride, just let them air dry. They're water - resistant, but if they get really dirty, you can wash them according to the fabric care instructions. Since they're made with an eco - friendly Blue Sign approved fabric, handle them gently to keep them in good condition for a long time.