Hanes - Boy''s X-Temp Thermal Underwear Set, X-Temp technology adapts to temperature, environment and activity to keep you cool and dry for all day comfort, Flat no rub seams, Soft waffle thermal knit fabric, Ribbed cuff ankles, Sturdy seams, Size X-Small = 2-4 Small = 6-8 Medium = 10-12 Large = 14-16 X-Large = 18-20, 60% Cotton 40% Polyester, Made in India, #41045