Your mini trail chaser should be just as outfitted for the walking, running, or mountain bike trails as you are. A quick-dry base layer is a must-have for any season, but it's especially important for staying warm in winter. Kids' clothing should be comfortable and loose enough for free movement to tackle tricky trails. Plus, add a hiking backpack to carry their water bottle and other trial necessities. Don't forget kids' trekking poles for particularly difficult terrain.