The sweet spot. Here's exactly what to wear for 45-degree runs.
What to Wear
Upper Body
Long Sleeve Shirt: Technical fabric, or short sleeve with arm sleeves
Optional Vest: For the first mile if you run cold
Lower Body
Running Shorts: Standard running shorts work perfectly
Accessories
Light Gloves (optional): For the first 5-10 minutes
Why 45°F is Ideal
45°F is in the perfect zone for distance running. You won't overheat on long runs, but you also won't need heavy layers. Many runners set PRs in 40-50°F conditions.
Tips
You should feel slightly cool at the start
Peel off gloves and tuck them in your waistband after warming up