Fellhof Baby Booties 100% lambs sheep wool leather fur cotton 100% sheep wool and leather. Knitted cuff made from 100% organic cotton. Made in EU. European size 16 = American size 0 = boot's sole length = approx. for 0-3 months. European size 18 = American size 2 = boot's sole length = approx. for 3-6 months. European size 20 = American size 4 = boot's sole length = approx. for 6-12 months.