ThreadTested

Best Value for Money Running Base Layers

Updated October 15, 2026. Prices checked October 15, 2026.

This range holds the first tops that runners have actually written about. iRunFar tested the Patagonia and the REI predecessor on runs, and the rest of the evidence comes from hiking and ski reviews. Read the scores as a guide for cool-weather running, since no source here is a full running test.

How these scores are built. Base layers are judged mainly on breathability, which counts for 45% of the score. Comfort and fit counts 25%, and the other two criteria count 15% each. Based on: Manufacturer specifications, independent reviews and owner reviews on retailer pages. Most independent reviews cover hiking, skiing or general use, not running. Breathability comes from OutdoorGearLab's and GearJunkie's breathability scores where they cover the product, and from our estimate where no test scores it. We do not test products in person. 8 source pages are linked under the 3 products so you can check each finding. How we score.

We may earn a commission when you buy through links on this page. It never changes our scores. Read the affiliate disclosure.

#ProductBest forBreathabilityScore
1Patagonia Capilene Midweight CrewBest overall87.7
2REI Co-op Merino 185 Long-Sleeve CrewLowest-cost merino76.9
3REI Co-op Midweight Long-Sleeve CrewBest value6.56.3

Patagonia Capilene Midweight Crew

Best overall, $95.00

7.7/10

Breathability 45%
8/10
Comfort and fit 25%
8/10
Odor control 15%
6/10
Durability 15%
8/10

Pros

  • iRunFar named it runner-up among the best base layers and calls it supremely breathable, with hollow-core yarns and a diamond-grid interior that help wick moisture. GearJunkie rates the Capilene Midweight 8.1 out of 10 for high-output activity.
  • iRunFar says it lasts longer than many base layers made from other materials. A REI owner reports a similar Capilene top still in use after 29 years.

Cons

  • iRunFar notes the HeiQ Mint odor control does not match wool. One trail runner on Alpinetrek used it for up to a week between washes.
  • It is not the warmest option when temperatures drop, and the fit is slim. REI has no owner reviews for this listing yet.

Sources: REI, iRunFar, GearJunkie, Alpinetrek

REI Co-op Merino 185 Long-Sleeve Crew

Lowest-cost merino, $84.95

6.9/10

Breathability 45%
7/10
Comfort and fit 25%
6.5/10
Odor control 15%
8/10
Durability 15%
6/10

Pros

  • Merino keeps its warmth when damp, and BetterTrail says it regulates temperature and wicks moisture from the skin.
  • BetterTrail says it undercuts much of the competition on price.

Cons

  • BetterTrail calls it a poor fit for high-output activity and winter running. It dries slowly and traps more heat than most synthetics.
  • The same review finds the fabric scratchier than Icebreaker or Smartwool. Some REI listings in this line are marked discontinued, so check stock.

Sources: REI, BetterTrail

REI Co-op Midweight Long-Sleeve Crew

Best value, $64.95

6.3/10

Breathability 45%
6.5/10
Comfort and fit 25%
6.5/10
Odor control 15%
5/10
Durability 15%
6.5/10

Pros

  • iRunFar named the earlier REI Co-op Midweight Long-Sleeve its best budget base layer and describes it as comfortable and versatile. That model is discontinued, and this crew sits in its place in REI's lineup.
  • It is made of 92 percent recycled polyester and 8 percent spandex, and Switchback Travel says it regulates temperature.

Cons

  • iRunFar lists it as less breathable than other options, with a loose and boxy fit that runs slightly big.
  • The reviews are for the earlier model. This version has only 6 owner reviews on REI, at 4.5 out of 5.

Sources: REI, iRunFar, REI (earlier model)

    How we picked

    Each score comes from manufacturer specifications, independent reviews and owner reviews. iRunFar’s guide is the only source here written by people who ran in the tops, and its page shows no test date. The other findings come from hiking, ski and general-use reviews, which test wicking and odor but not the sustained sweat of a long run.

    The Patagonia has the strongest evidence. The two REI tops have less, and the REI Midweight rests on the review of its predecessor.

    What we left out

    • Montane Dart Zip Neck: iRunFar’s top pick, but we could only read a UK price.
    • Helly Hansen LIFA Stripe Crew: it costs $50.00, so it sits in the budget ranking.
    • Cotopaxi Debajo Seamless Crew ($80): iRunFar says it smells after two uses without a wash.
    • Under Armour OutRun The Cold Long Sleeve: one 2023 roundup lists it at $60, but we found no independent review and no US retailer price.

    What to look for

    • A slim fit that stays against the skin
    • A fabric that matches your effort: synthetic for hard efforts, merino for easy days and odor
    • Odor treatment, if you wear the top for several runs between washes

    Questions

    Why is the REI Midweight ranked on a review of an older model?

    REI replaced the discontinued Midweight Long-Sleeve with this crew. We found no independent review of the new one, so its scores lean on the earlier model and carry more doubt.

    Why no Patagonia Capilene Lightweight?

    REI does not say whether the listing is long sleeve, it has no owner reviews, and the only independent review we found covers the bottoms.

    Where do the prices come from?

    The regular price on REI on October 15, 2026. Sale and outlet prices are ignored.