Thickened Thermal Fabric: The long underwear boys is made from 95% Polyester and 5% Spandex with velvet inside, which can keep your boy warm in cold winter and chilly nights. Our long johns for boys is lightweight in normal thickness, keeps your kids comfortable without feeling bulky Air Permeability Not Stuffy : The boys thermal underwear set is hygroscopic and sweat releasing. The fleece lined base layer is moisture wicking. When your child sweats, it can absorb moisture from his skin to avoid any sticky feeling Suitable for Any Activities：The toddler long johns set is good for daily wear at home as warm base layer. Besides, the boys wool long underwear is ideal for under clothes when your boys are running, hiking, biking, hunting, skiing, camping etc. Your kids can wear them while doing any activities Four Way Stretchable：The stretchy fabric of kids long underwear offers flexibility no matter how active you boys are. The wide-band design of the pants allows us to avoid tension and discomfort, effectively protecting the delicate skin of children No Decoloring and Pilling：The boys base layer set washes well in the machine without shrinking or running color. Still comfortable, warm and ultra-soft after many washes Material: 95% polyester, 5% spandex 10 colors available: Black, White, Nude etc. Waist: elastic widened belt Clothing care: Machine Wash Package Contents: 1 x Thermal Underwear for Boy GAZIAR Thermal Underwear for Boys Long Underwear Set Ultra Soft