We The Free Green Henley Thermal, also known as the "Rainbow Thermal"

It is a long-sleeve waffle-knit shirt with patterned trim on the cuffs and along the neckline. It is part of the "We The Free" collection, which focuses on heritage-inspired, classic, and lived-in staples. The shirt is described as having a relaxed and slouchy fit. The patterned trim on the cuffs and collar is a distinctive feature of this particular style.