Okay little buddy, have you ever seen those really comfortable shorts that boxers wear when they are practicing or fighting in the ring? Those are called boxer shorts! They are very loose fitting and go down to your thighs, kind of like really baggy shorts.
Boxer shorts are made out of a soft and comfortable material, usually cotton or a blend of cotton and polyester. This makes them very breathable and helps keep you cool, which is important when you are running around and expending energy like boxers do.
They have an elastic waistband that helps keep them in place, but they don't have any other tight elastic bands or materials around the legs. This is because they want to make sure there is plenty of room for movement and flexibility when they are fighting.
Boxer shorts also come in all different kinds of colors and patterns, so you can find ones that match your style or favorite sports team. They are not just for boxers, anyone can wear them for comfort and flexibility.
So, to sum it up, boxer shorts are really comfortable and loose-fitting shorts made out of soft materials that allow for a lot of movement and breathe-ability. They are great for people who like to stay active or just want to be really comfortable.