For Hatley's boot sizing . The Hatley Kids Boot Liner Socks add extra warmth and coziness on those cold and dreary days. Top edge folds over the boot collar to add a touch of color. Keeps rain boot pull tab easily accessible through buttonholes at back seam. 100% polyester. Imported. Measurements: Weight: 1 oz Product measurements were taken using size Small (8-10 Toddler), width M. Please note that measurements may vary by size.