Alpaca wool is better than merino.....

[GoatPackr]

I'm also curious on the differences in real world performance between the 70% and the 100%. Looking to order a pair to test during the winter months, but not sure which one to get.

I believe the Mongolian Camel Wool that I ordered was 100%
I'm actually planning to order a few more of these. Hopefully I can find some a little taller as the pair I have is a little low. They work but just a little taller would be perfect.