COLD-WEATHER READY: Help your kids stay cozy in the cold with a brushed fleece inside and matte soft outside. Our 2-piece thermal set has moisture-wicking fabric that absorbs and evaporates moisture. SPANDEX STRETCH: This boys top and bottom set features a spandex stretch that provides flexible comfort for busy activities. They’ll feel snug and warm during chilly adventures. HEAD-TO-TOE PROTECTION: Our thermal underwear has 50+ protection from harmful UV rays. With a thumbhole sleeve top, modern rise leggings, and a functional fly, your boys will look and feel great all day and night. COMPLETE COMFORT: They’ll feel warm without the bulk with our stylish base layer sets. The tag-free label helps reduce irritation for a seamless, itch-free experience without distractions. Live in Layers: For 50+ years, Cuddl Duds has provided comfy thermal underwear. Our innovative technology helps you stay warm and look good doing it — because layering is a lifestyle. Help your children stay warm and comfortable this winter with this thermal underwear for kids. Designed to withstand even the harshest conditions, these comfy sets are perfect for cold winter nights or for layering under clothes. With a brushed fleece inside and matte soft outside, these long johns for boys help provide extra warmth and comfort. All of our thermal sets include a top and bottom, making it easy to coordinate with any cold weather outfit. What sets us apart is the advanced technology used in our designs. The material is moisture-wicking, evenly dispersing moisture across the surface of the fabric where it evaporates, ensuring they stay dry and comfortable. It also features a super spandex stretch, providing flexible, on-the-go comfort while hugging your child’s body for a snug fit. The densely knit fabric shields your kids from harmful UV rays, adding an extra layer of protection while outdoors. Perfect for winter sports, hiking, or just lounging, this set is an essential addition to any winter wardrobe.