1.92% Polyester, 8% Spandex 2.Ultra Soft and Comfortable: 92% Microfiber (Polyester) + 8% Spandex, smooth, lightweight, durable 3.Fleece Lined Keep Warm: Girl long underwear thermals knit sets with Fleece Lining in nice thickness, gives your kids warmth for indoor outdoor activities. 4.Comfy Skin Stretch: Four Way stretch materials with an elastic waistband, this baselayer long john set perfectly fits body curves, keeps cozy in winter. 5.Sweat Moisture Wicking: The thin light weight thermals clothing maintains your toddler child body heat and breathable in the extreme cold weather.