EVERYDAY PERFORMANCE: Help keep your kids stay cool, comfy, and moving freely in our lightweight 170 GSM base layer set - sleeker and more breathable than our winter heavyweight thermal set. Perfect for year-round wear, indoor comfort, or layering during mild weather. MADE TO MOVE: This tag-free set includes a long sleeve shirt with thumbholes and high-rise leggings with a functional fly for everyday convenience. 4-way stretch fabric and a close-to-the-body fit provide breathable flexibility through every activity. READY FOR ANYTHING: Whether he's heading to school, staying active outdoors, or winding down at home, this base layer delivers moisture-wicking comfort that keeps up with him from start to finish. ALL-DAY COMFORT: A soft interior and smooth outer layer ensure easy layering under everyday clothes. UV protection and tagless construction keep irritation at bay for all-day wear. LIVE IN LAYERS, EVERYDAY: For over 50 years, Cuddl Duds has created soft, comfortable layers that kids love to live in. Our lightweight base layers for boys are made for year-round comfort, flexibility, and all-day ease. Built for motion and made to breathe, the Cuddl Duds Boy’s Lightweight Active Base Layer Set is the ultimate base for year-round comfort. This 2-piece thermal set for boys includes a long sleeve top and thermal leggings, made from a 170 GSM lightweight fabric that feels soft on the inside and smooth on the outside. It’s less bulky than traditional cold-weather gear - perfect for layering, lounging, or active play. The 4-way stretch fabric and close-to-the-body fit move with him, while moisture-wicking performance helps keep him dry. The tag-free design and functional fly leggings provide easy comfort, and UV protection offers added confidence for sunny days. Whether he’s heading to school, running around the house, or out with friends, this lightweight base layer for boys delivers breathable comfort that lasts all day. A go-to for everyday wear, this set is the perfect combination of flexibility and softness - making it an ideal pair of long johns for kids who never stop moving.