If you buy through our links, we may earn an affiliate commission. This supports our mission to get more people active and outside.Learn about Outside Online's affiliate link policy

(Photo: Inga Hendrickson)
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.
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.
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.
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.
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.
Fashioned from spandex and merino, these gloves trap warmth without sacrificing dexterity.
Simpler is often better. This single-bottle holster sits comfortably around the waist, thanks to mesh and an adjustable belt.
The Halo Fire is bulkier than other designs, but it makes up for it with five lighting modes.
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.
The Trail Pacer’s fit is subtly tapered, and the mix of spandex and polyester is soft enough to wear to bed.