40°F (4°C) is a tricky temperature - too cold for shorts, but easy to overdress. Here's exactly what to wear.
You'll warm up 10-15° while running
Base layer + optional vest/jacket
Add a layer if windy
Long Sleeve Base Layer
Moisture-wicking thermal top
Light Running Vest or Jacket
Wind protection for core
Running Tights or Pants
Full-length for warmth
Light Gloves
Thin running gloves
Ear Warmers or Headband
Protect ears from cold
Fleece-lined warmth with a clean silhouette
$128
Touchscreen-compatible, windproof, and packable
$55
Warm, itch-free merino blend for cold runs
$38
The best running sock — cushioned, seamless, blister-proof
$17
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