Hi Graham,
Thank you for taking the time to provide your feedback.
The Lana Bambini socks you purchased are made without any synthetic (man-made) fibres. While this provides the natural fibre benefits many of our customers prefer, synthetic fibres do significantly increase the durability and lifespan of a sock. This is also one of the reasons why darning socks, as was commonly done in the past, is much less common today.
The lifespan of any sock can vary considerably depending on a number of factors, including how well the footwear fits, how frequently the socks are worn, the type of activities they are used for, and how they are washed and cared for.
I would also like to note that, as a gesture of goodwill, our store provided you with a refund for this pair of socks.
We appreciate your feedback and thank you for giving our socks a try.