The Kids Base Layer Sets in size medium are perfect for boys and girls during the winter and fall seasons. Made from spandex fabric with a fleece lining, these base layers provide thermal comfort and flexibility for active kids. The solid pattern in a multicolor design adds a stylish touch, while the long sleeves ensure warmth in colder weather. With a 2-piece set including a top and bottoms, these machine washable base layers are a practical and cozy addition to any child's sleepwear collection.