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The Mountain Hardwear Effusion Power 1/2-Zip Top piles in so much tech into its compact design that if you're looking at just the specs, it might be hard to tell if you're checking out a piece of performance clothing or a space ship. This highly technical piece with Dry.Q Active technology shields you from wet, windy weather and quickly ditches internal moisture from sweat. Zip up in this pullover whenever you're going to mix the outdoors with intense cardio work.

  • Active Solution fabric on the body blocks moisture and wind to keep you dry
  • Integrated Dry.Q Active membrane seals out moisture while remaining highly breathable
  • Stretch Tech panels quickly wick moisture by moving sweat from its soft micro-fleece interior to its nylon face
  • DWR finish sheds moisture's initial onslaught to keep you drier longer
  • Hybrid MCZ construction puts the right material in the right place to optimize performance and comfort
  • Semi-fitted cut is designed for performance without being skin tigh
  • One-handed hem drawcord seals out the elements
  • Internal media pocket keeps your music pumping
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Great Running Pullover

  • Familiarity:I've used it several times

This has become my go-to running jacket in 35-45 degree temps. A little colder if it's not windy and a little warmer if it's very windy. It breathes well and is vented in all of the right places. I usually wear it with a shortsleeve baselayer underneath but I have also worn it with a light longsleeve baselayer.

The jacket is well constructed, light (not overbuilt), has everything I was looking for and is true to size. The only reason I did not give it five stars is because it is a little short in the torso, which seems to be a recurring problem for MHW. Unlike some of their shirts and jackets, however, it is long enough that I did not have to return it.