Tracksmith Waffle Shirt ($98)
When it comes to cold-weather base layers, merino wool is the way to go. Pockets formed by the waffle knit on this cozy piece trap air and help insulate on long runs.
Columbia Rogue Runner Jacket ($199)
The Rogue Runner is your best friend when conditions turn from merely cold to gnarly. This fully waterproof, reflective outer layer will keep you dry even in a vicious downpour.
REI Co-op On the Trail Vest ($70)
Water-repellent, wind-resistant, and equipped with reflective hits, this vest has a lot going for it. It’s perfect for days when you want just a bit more insulation.
Seirus Magne-Mask Bandit Combo Hinged Headliner Balaclava ($40)
When your nose feels like it’s about to snap off from frostbite, the neoprene strip on this hood-scarf combo will help shield it.
Fits Micro Light Runner Trail Mini-Crew Socks ($20)
Venting and heel and toe padding lend these merino-nylon socks breathability and support, and the mini-crew height sits snug between ankle and calf.
Icebreaker Tech Trainer Hybrid Gloves ($60)
Fashioned from spandex and merino, these gloves trap warmth without sacrificing dexterity.
Mountainsmith Dart Hydration Pack ($40)
Simpler is often better. This single-bottle holster sits comfortably around the waist, thanks to mesh and an adjustable belt.
Nathan Halo Fire Headlamp ($120)
The Halo Fire is bulkier than other designs, but it makes up for it with five lighting modes.
Runderwear 5-Inch Boxer-Briefs ($28)
We tested Runderwear’s boxer-briefs at the 2019 Boston Marathon. The blend of polyamide and elastane offered rash-free comfort for all 26.2 miles.
Patagonia Trail Pacer Pants ($99)
The Trail Pacer’s fit is subtly tapered, and the mix of spandex and polyester is soft enough to wear to bed.