●[Comfort and Warmth]: Our boys thermal shirt are crafted with a blend of 92% polyester and 13% spandex, offering a soft, comfortable, and breathable fabric. The inner layer is made of fleece fabric, which efficiently absorbs body heat, effectively locks in body temperature, and keeps out chilly air, providing a cozy and comfortable wearing experience. ●[Upgraded Fabric]: Runhit boys thermal shirt are crafted with a snug and four-way stretch design, contouring to their body curves and offering excellent fit and flexibility. Additionally, the thermal youth compression shirts feature odor and sweat-resistant properties, ensuring kids stay fresh and comfortable during their activities. ●[Fashionable and Dynamic]: The contrasting color block design of our boys thermal long sleeve shirts adds a touch of style and uniqueness. The flat seam construction ensures a smooth and comfortable fit, reducing discomfort and friction. The round neck design offers extra warmth, hugging the neck snugly and providing a cozy feel. ●[Versatile Wear]: Runhit boys thermal long sleeve shirts can be worn as comfortable sleepwear or layered under clothing. In addition to that, these multi-functional thermal youth sports shirt are perfect cold gear for outdoor adventures, camping, baseball, skiing, soccer, football, snow biking, and more, allowing kids to fully enjoy outdoor activities and winter sports. ●[Warm Gift Choice]: Our boys thermal long sleeve shirts are specially designed for kids of all ages, offering a range of sizes suitable for children and teenagers. Whether its Christmas, Halloween, birthdays, New Years, or any other special occasion, these youth thermal base layer make practical and cozy winter gifts for children.