Trimfit Boys Space Dye Long-Sleeve w/Thumbholes Thermal Long Underwear Set Includes 1 Thermal shirt and 1 pair of thermal pants Moisture Wicking. Anti-Mircobial. Soft & Breathable Flat lock seams to prevent chafing. Thumbhole. Tagless Machine wash cold with like colors. Only non-chlorine bleach when needed. Tumble dry low. Do not iron Trimfit. Wear Tested since 1930