Alpaca Boot Socks

To be frank I found my feet slipped around in my runners creating friction under my feet,which i felt would lead to blisters. They would be a great winter sock to sleep in on the track as theyre very warm

Best ever socks, the boot socks are warm, soft, and actually stay up on the calf rather than sagging

Generally pretty happy but I did think they were going to be thicker. Maybe my feet are destined to always have a bit of chill. I noted that some of the socks are different in length. Is there any chance crew socks could have been labelled as boot socks? Is it normal for the socks to shed fleece while they are new?