Kid s Waffle Thermal Long Underwear 2-Piece Set by Boys Only. This classic insulated underwear set is tagless for comfort and has a modern cut for easy layering. This set is warm while also providing breathability to give you the perfect combination. The soft waffle thermal knit fabric feels great against the skin and will not cause chafing. Walmart marketplace seller Belt Outlet specializes in sale-priced Thermal Sets and clothing accessories for men women and children. We carry quality belts wallets headwear cold weather accessories underwear including Thermal Underwear for Kids.