** EXTRA-FINE AND SOFT MATERIAL: 50.4% Polyester, 17% Wool,15% Chinlon,15% Acrylic,2.6 spandex. Made of Native Wool + Lycra Elastic fibers blend,our boys wool crew socks provides superior softness and elasticity,perfect composition of warmth and comfort.This is a medium-thick socks for daily use. If you like thickening, we recommend you choose Thickened Mix 6 Pack. ** SNUG FIT WARM AND BREATHABLE: These are cozy warm winter socks for kids,designed to be an ideal choice for boys and girls winter every wearing. Moisture-managing wool fabric also provides dry, fresh and breathable even in all seasons. ** OPTIMAL THICK SEAMLESS SOCKS DESIGN: Rib nitted thicken fabric,not too thick,not too thin,enables our casual wool socks to resist shrinking.Reinforced toe and heel,smooth seam stitches in places where they’ll rub or rip,designed for added comfort. ** CLASSIC ALL MATCH STYLE: The different color scheme boys and girls wool socks are with crew socks quater length,for easy everday wearing around the house and suitable for a variety of outdoor leisure such as running, hiking, gym training,cycling,and more. ** WASHING TIPS: Please note minor pilling of wool is possible and common but not quality problem. Recommend hand wash to ensure less pilling and deformation.