How is Eudae different than merino wool?
Eudae has similar performance characteristics to merino wool, but is superior for a few reasons.
Firstly, the Eudae is much softer and more comfortable than any merino shirt out there. It's never itchy, and it'll probably be the most comfortable tee you've ever worn. Eudae also has a more natural look compared to merino; many merino tees look technical.
Eudae's quick-drying and sweat-wicking ability is comparable to merino. Merino probably just edges out Eudae in odor fighting, but not by much. Odor control with Eudae tees is definitely superior to other synthetic tees- you should be able to get a few sweaty wears without odor before you need to wash.
Eudae is completely Vegan -- it's made from recycled bottles and the pulp of Eucalyptus trees, so no animals are harmed or involved in the process in any way. Wool is great, but think of the sheep.
If you want to read a candid review and in-the-field comparison of 100% polyester, vs. merino, vs. Eudae, check it out Steve's notes on everydaywear.net.