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Gut-busting trail runs, wind sprints at last light, and early-morning workouts all call for the SmartWool Men's Phd Run Zip Top. The merino wool blend manages moisture and regulates your core temperature while the flatlock seam construction ensures total chafe-free comfort.

  • Merino wool and nylon blend helps keep your core temperature stable, deals with odor, and feels super soft against your skin
  • Semi-form fit is ideal for high-exertion activities
  • Seamless construction provides chafe-free comfort
  • 8-inch center front zip provides ventilation
  • UPF 40 rating helps you avoid harmful sunburn
  • Reflective SmartWool logo at hem increases visibility in low-light conditions
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