The Sense Merino Long-Sleeve Tee pairs 49% merino wool with 51% polyamide, so the fabric carries merino's natural softness and odor resistance without giving up the quick-dry time a pure wool base layer can't match. 37. 5(R) Technology works underneath that blend, pulling moisture and odor-causing compounds out at the vapor stage before they ever become sweat sitting on skin, and drying five times faster than comparable fabrics in the process. At 7 ounces in a regular fit, it layers cleanly under a shell for running or winter endurance efforts without adding bulk. What Our Gearhead(R) Experts Are Saying:"I've worn this three days straight on a hut trip without a hint of funk creeping in. The 37. 5 Technology is doing real work there, not just riding on merino's reputation."