The Runner
The Outfit: Keep warm during morning runs with a down vest that feels pencil-thin and a merino-wool base layer, and eliminate chafing from long treks with lined shorts—this Asics pair also boasts reflective elements. At just seven ounces, the New Balance racing shoe will leave you light on your feet.

The Extras: Minimize distractions with tangle-free Bluetooth headphones by JayBird and a handheld hydration set from Salomon.

Aeroloft 800 Vest by Nike x Undercover Gyakusou ($200), at select Niketown Stores. Oasis Longsleeve Crew by Ice Breaker ($80). Asics 2-N-1 Shorts ($46) and Kayano Classic Low-Cut Socks ($14). New Balance 1400 Racing Flat ($90). JayBird Bluebuds X ($166), Salomon Sense Hydro S-Lab Handheld Hydration Set ($40).