Arch brace holds the sock in place and adds additional support. Flat-knit toe seam keeps you comfortable throughout the day. Made in the USA of New Zealand ZqueTM Merino wool. * Light, half-cushioning is perfect for moderate hiking or aggressive walking. 72% merino wool, 27% nylon, 1% elastic. Washer and dryer friendly! * Women"s sock sizes Small (shoe size 4-6.5) Medium (shoe size 7-9.5) Large (shoe size 10-12.5) NOTE Women"s size Small fits Youth shoe size 2-4.5)