I really love this top. I originally bought it to wear as a casual-wear type crop top with high waist jeans, but it's really more of an athletic-type top. I wore it out hiking in Zion NP with a pair of cute high-waist shorts (to reduce bare belly) and it performed really nicely. I hiked for 3 hrs in sunny 90 degree weather and by the next day I could have worn it a second time. No smell, no stretching, just awesome.
PROS: thick material (imagine a cotton lycra like old-school leggings, or lululemon luon), extremely comfortable, zero backpack rub on the seams, durable. Anti-stink and all the awesome qualities of merino with updated on-trend styling!
CONS: It's REALLY above-the-belly button cropped. I'd own this shirt in every color if it were about 1" - 1.5" longer. I'm 5'7" 138lbs with a short torso and the top fits me exactly the same as the model, with my belly button showing. I *really* don't like my belly button to show.
FIT: 5'7" 138lbs 34B, I wear xs in Woolly's cropped tank and cropped tshirt, and Small in their regular tshirt. I got this top in both small and med, and I kept the med. (!!!) The small was probably a better fit (the med fits me as more of a relaxed/ roomy fit), but I felt that the medium was maybe .25 - .5" longer, so kept it despite it being a little baggy around the arm holes.