You're in for a smooth sailing on the sock front at least with the Smartwool Kids Llb Micro Micro. Higher density impact zones with WOW Technology for longer lasting wool benefits and comfort. Ribbed cuff offers exceptional hold. Flat knit toe seam. Elasticized arch brace for additional comfort. Materials: 72% Merino wool, 26% nylon, 2% elastane. Machine wash cold and tumble dry low. Made in the USA.