Our alpaca sock yarn is the softest sock yarn I have ever knitted in and it can also easily be used for e.g. to knit sweaters in. Be aware that it must be hand washed because of the alpaca in it.
Our Sock base is an ordinary sock yarn with nylon in it and which can be machine washed. However, it is a delicious sock yarn that can also easily be used for projects other than socks. Children's clothing is one of the projects I thought it was suitable for precisely because it can be machine washed. It is a category B on my AKW scale as it contains merino, which some allergy sufferers cannot tolerate, but it is so soft that it does not belong under C.