Nickelodeon TMNT Ninja Turtles Boys Thermal Underwear Set (Little Kid/Big Kid) Cotton/Polyester Blend Imported Machine Wash Cold Thermal long underwear set; Not intended for sleepwear Long sleeves; Ribbed-knit collar and cuffs Sublimated graphics; Elastic waist Features Nickelodeon's Teenage Mutant Ninja Turtles: Leonardo, Michelangelo, Donatello, and Raphael