Patagonia Thermal Airshed Jacket ($259)
This light, 颅water-resistant jacket gains extra warmth from a proprietary 100 percent recycled synthetic fill that鈥檚 warm like down but retains its loft when wet颅鈥攑erfect for chilly days and mixed precipitation. The only two pockets are internal: one zippered, one to stuff the jacket into.
Feetures Elite Decoded 2.0 Socks ($18)
Constructed from a nylon-spandex blend with midfoot compression, Feetures鈥 new Decoded line grips the foot like it was customized just for you. The seamless toe provides additional blister protection.
Smartwool Merino 250 颅Baselayer Pattern Crew Shirt ($110)
When it comes to base layers that fuse warmth, breathability, and the capacity to ward off stink for multiple days, it鈥檚 hard to beat merino. Smartwool makes some of the best. Its beloved heavyweight Merino 250 top just got even better, with a slimmer, more athletic fit.
Seirus HW Gore-Tex Infinium Trace Gloves ($55)
Thanks to its Gore-Tex Infinium shell, the Trace Glove from Seirus is water resistant and totally windproof颅鈥攋ust what you need to prevent numb digits. Touchscreen-颅compatible tech颅nology on the thumb and pointer finger lets you send text messages, skip songs, and check Strava midrun.
Korkers Ice Runner Cleats ($60)
An easy-to-use Boa fastening system makes the Ice Runner fit snugly over most running shoes. It has 11 replaceable carbide spikes per cleat (five in back, six in front) and the pair fits in your pocket when the ice disappears.
Maurten Gel 100 Caf 100 Gels ($50 for 12)
Maurten鈥檚 gels are ideal for getting a serious caffeine fix while working out or speeding for the finish line. Each serving contains 25 grams of carbohydrates and 100 milligrams of caffeine.
Buff DryFlx+ Neck Warmer ($42)
Crafted from a blend of polyamide, polyester, and elastane, this neck tube provides warmth and breathability. Strategically placed air holes let you cover your mouth and nose, so you can still push it on truly frigid days without asphyxiating.
Tracksmith Turnover Tights ($128)
Still the most comfortable running tights on the market, the Turnovers feature a dreamy micro-nylon and elastane blend that鈥檚 silky yet warm, and extended ankle zips that won鈥檛 chafe. The roomy, zippered back waist pocket fits a smartphone, a key, and credit cards.