The Sense Merino Long-Sleeve T-Shirt pairs 37. 5(R) Technology with merino wool to pull moisture and odor away before they build up, drying five times faster than similar fabrics so a long effort doesn't turn into a damp one. The regular fit balances comfort and freedom of movement, holding up as well on the run as it does for whatever comes after. What Our Gearhead(R) Experts Are Saying:"I wore this on a long trail day that ran past six hours in the sun, and it never held onto that sour, worked-hard smell the way my old synthetic layers do. It dried out on its own during a break at the car before I'd even changed out of it."