Microfiber polyester yarns make the fabric of these thermal fleece leggings so soft to the touch! Billowy warmth without weight, these base layer leggings for kids are durable and breathable. When its cold, this is an excellent choice for layering without bulk. Billowy warmth without weight Acclimate Dry hydrophobic yarns for moisture management Microfiber polyester is exceptionally durable Flat seam construction for seam strength and longevity Heavyweight warmth, active fit Imported 92% Polyester / 8% Spandex; 220 gsm Polarmax Unisex Stretch Fit Natural-Rise Youth Micro Fleece Tights