From Pattern Description
These ankle-length socks are knitted in the round from light-weight (DK) yarn, so there is a huge range of yarns available for you to make the socks in whatever colour and fibre you prefer. Here we’ve given the socks a lively twist by working them in a minty-fresh colourway and added some cute pompoms as a trim to the ribbed cuff.

There is an error on the stitch count after the stitches have been picked up for the gusset.
The pattern states there should be 66 72: 80 stitches.
In fact the stitch count should be 58 64: 70.
The stitch count after the Shape Gusset instructions in the pattern are correct.