These slipper socks are best handwashed with stergene, woollite or something similar. Afterwards lay the slipper socks flat to dry.
Bamboo is wonderful. It is very fast growing, which means a big tick in the sustainable box, and it is hypoallergenic, so is good for clothing which is in direct contact with the skin. It is also super soft, moisture wicking and it doesn't harbour odour (so perfect for socks!).
Alpaca wool is also hypoallergenic as it does not contain lanolin like sheep’s wool, so most people can wear alpaca even if they are allergic to sheep's wool.