When the temperature drops but your kids still want to be active outdoors, this Youper compression shirt has you covered. It's made with this awesome stretchy thermal fabric that has a brushed inner lining - feels super soft against the skin and really traps body heat to keep them warm. The four-way stretch moves with their body whether they're throwing a baseball, kicking a soccer ball, or just running around the field. What's really cool is the moisture-wicking technology that pulls sweat away from the skin, so they stay dry and comfortable even during intense practice sessions. The flatlock seams are a nice touch too - no annoying chafing or irritation. Made from 88% polyester and 12% elastane, it's lightweight but surprisingly warm. Sizing is straightforward: XS fits chest 25.5-26\\\ for kids around 47-51\\\ tall, Small for 26-27\\\ chest and 51-55\\\ height, all the way up to XL for 32-35\\\ chest and 63-67\\\ height. Perfect for football, baseball, soccer, hockey, snowboarding - basically any cold-weather sport. Easy care too - just toss in cold water and tumble dry low. Plus they back it with a 30-day return policy and lifetime warranty, which is pretty rare for kids' sports gear!