thermal are made with modern technology to be thin and warm hence it can be worn under any of your attire.Ribbed cuff to prevent riding up and 'no sag' grip.Good coverage at chest and neck to seal body warmth.Long sleeves for warmth and comfort on the arms Crafted by skilled personnel using state-of-the-art technology to ensure value for wearing. Superior Body hugging fit Baby (Unisex) Winter wear Set - Upper & Lower. Fabric: Cotton thermal set for kids