The pattern comes in two versions:

• worked flat and then sewed
• worked in the round and seamless

The yarn I used is microfiber, worked with a needle slightly smaller then recommended. As alternatives, I suggest to use stretchy yarns to keep the rib pattern in shape.

The weight of the yarn used in the pattern is such that

50gr = 100m/109yds

if you choose an alternative yarn, look for something with similar weight.