Probably the warmest socks you can find for your child. Yak wool is warmer than cashmere, but also soft and breathable. Perfect on the coldest days.  Tip: wear over thin cotton socks, or a onesie, then you do not need to wash these socks often.  * Made with 100% undyed Mongolian Yak Wool * Hand wash at max 30°C and dry flat * Possible to machine wash on a wool program at max 30°C * Do not tumble dry.