2nds . Seamless, lightweight and ever-so-comfortable, SmartWool's PhD Run Zip shirt helps regulate your body temp across a variety of conditions and features built-in knit ventilation zones for breathability where it's needed most.

• Itch-free merino wool is temperature regulating, moisture wicking and odor resistant
• Lightweight and seamless construction with chafe-free flatlock seams
• Long raglan sleeves
• Knit ventilation zones down sides and under arms
• Limit 12 per year
• Classic Fit
• Made in Turkey
• US shipments only