Antimicrobial: yes, natural attribute of merino wool
UPF Rating: 30
FEATURES of the Smartwool Men's NTS Micro 150 Tee Jersey knit: UPF 30 Crew neck with set-in short sleeves Stripe tape binding at back neck and contrast color internal stitching detail Flatlock seam construction designed to eliminate chafing Heat transfer logo at left hip SPECIFICATIONS of the Smartwool Men's NTS Micro 150 Tee Form Fit 100% Merino Wool Garment Weight: 4.94 oz / 140 g Fabric Weight: 4.5 oz/yd2 / 150 gm/m2