Material: Rib knit Size: 110-170Thermal Underwear Set for Boys (2 pcs) Material: Ribbed fabric with Lycra Composition: 85% cotton, 15% Lycra Color: Classic black Season: Winter Gender: Boys This thermal underwear set for boys is designed to provide exceptional comfort and warmth during the cold season. Made from a soft and elastic ribbed fabric with Lycra, it ensures durability, flexibility, and a perfect fit. The innovative material effectively retains body heat while wicking away moisture, keeping your child dry and comfortable even during high physical activity. The set includes a long-sleeve top and leggings, both featuring an ergonomic design for maximum freedom of movement. The extended top length protects the lower back from drafts, while the leggings contour the body for a snug and secure fit. Ideal for outdoor activities such as hiking, snowboarding, skiing, or everyday wear, this thermal set is suitable for children with a height range of 110-170 cm. It is lightweight and does not add bulk under outerwear, making it a practical choice for school and active leisure. Care instructions: - Machine wash at temperatures not exceeding 30°C. - Avoid pre-soaking. - Do not dry on heating appliances or under direct sunlight.