The Ultra Merino range has already been featured in our #baselayer edition (016), though on the topic of workout gear, I had to bring this one back.
Icebreaker and Smartwool are two solid merino alternatives, but KUIU's implementation of Nuyarn technology separates this series from the rest of the pack.
As a self proclaimed gear nerd, I can testify to how breathable, lightweight, comfortable, fast drying, and well-made these products are - without a doubt best in field.