Why is this the answer?

The answer is gloves because this clever riddle uses fun word tricks to describe what happens when you put your hands inside them! Let's look at the first part of the riddle: "What I am filled, I can point the way." A glove is "filled" when you put your hand inside it. Your hand gives the glove its perfect shape and strength, stretching the fabric right out to the fingertips. When your hand is inside the glove, you can use your strong fingers to point in any direction. You could point at a star in the sky, a friend across the playground, or the direction you need to go to get to the library or the park. The glove helps cover and protect your hand, but it is your powerful fingers inside that are doing the pointing, making the filled glove able to show the way to anyone who asks. It’s a trick of language because the glove isn't pointing itself, but it can point when it is 'filled' with your hand. Now for the next part: "When I am empty. Nothing moves me." Imagine taking your hand out of the glove at the end of a chilly day. The glove suddenly becomes floppy and soft, losing all its rigid shape. It can’t stand up on its own, and it certainly can’t point its fingers or wave hello! If you leave it on the floor or the table, it just lies there limp and perfectly still. Only a human hand, or sometimes a special wooden hand used for storing them, can "move" the glove and give it life. Without a hand to fill it and give it power, it is truly empty and motionless. The riddle is being very smart by making you think about how an object only performs its action when you start to use it. Finally, the riddle says: "I have two skins. One without and one within." Most gloves, especially those made for keeping warm in the winter, are made with two separate layers to keep your hands extra cozy and comfortable. The outside layer, or the "skin without," might be made of colorful wool, strong leather, or a stretchy synthetic material, and it’s what everyone sees when you wear them. The inside layer, the "skin within," is the soft, fuzzy lining, maybe a warm fleece or soft cotton, that touches your own skin. This inner lining is the glove’s second skin that makes it cozy and helps protect your hands from the cold wind and snow. So, the "two skins" are the strong outer shell and the warm inner lining of the glove.