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When trail running with a T-shirt on would be too cold and a long-sleeve baselayer too warm, the Icebreaker Men's Base Layer 200 Sprint Zip-Neck Long-Sleeve Top is just right. Its merino wool regulates your body temperature so you don't get too hot or too cold, and it's naturally antimicrobial so the top won't get super stinky even if you don't have access to laundry for a few days. When you're on uphill battles, just use the zipper at the neck to quickly dump excess heat. Icebreaker added a bit of Lycra and gussets to give you the amount of stretch you need. Thumbholes keep the sleeves in place whether you're pumping up the last hill or layering on top of the Sprint for snowshoeing or ski touring.

  • 96% merino wool, 4% Lycra
  • Naturally antimicrobial
  • Slim fit
  • Half-zip front
  • Thumbholes
  • Flatlock seams

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Here's what others have to say...


Love this thing

  • Familiarity:I've put it through the wringer
  • Fit:True to size

This is my favorite cold weather base layer. I use it for running, biking, and backcountry skiing. Merino wool is unbeatable for temperature regulation and odor resistance.