Hiking my first 14er was the first time I learned that โcotton kills.โ Thankfully, I didnโt actually die. I was 16 at the time, on top of Longs Peak, one of Coloradoโs 53 peaks over 14,000 feet high, a.k.a., 14ers. And I learned the hard way how much colder it can be at 14,000 feet than 8,000โand that wearing a cotton shirt soaked with sweat while a storm is rolling in is a surefire way to feel uncomfortable. I ripped my jeans, shivered on the summit and had to borrow a strangerโs water filter because my bottle was empty before I even reached the top, but like many people, I desperately wanted to do more. And 20 years later, I can happily say Iโve ticked off several more 14ers around the stateโa few of them many times, including at night, in the winter, running or by more technical routes. Iโve learned a few thingsโI rarely wear cotton t-shirts up there, for oneโand Iโm always excited to meet people who are heading up their first 14er. If youโre planning your first 14er, hereโs how to layer for maximum comfort. Start with synthetic or wool underwear. Even if you have high-quality hiking pants or a fancy wicking shirt, if your underwear or bra is cotton, itโs going to stay wet once it gets sweaty, and that will probably make you cold on top. Shorts might be OKโbut with tights or pants, youโll be certain to be comfy. In the height of summer season, with perfect weather, you can probably get away with wearing running shorts (I personally love the Zendo Shorts) or synthetic soft shell hiking shorts if I want more pockets. But itโs likely to be chilly on top, and the sunโs exposure is much more harsh that high above sea level, so I often opt for breathable, lightweight tights like the Essentia Tights, the Vantage 7/8 Leggings, or soft shell pants like the Voodoo Pants or Ferrosi Pants. These have great stretch, for taking the big steps, and the soft shell pants are abrasion-resistant, in case you think you might do any butt-scooting, like I did my first time descending Longs Peak. Shop Women's Bottoms On top, start cold. Another lesson Iโve learned since my first 14er is that itโs best to start your hike dressed in lighter layers than what would be comfortable just standing still. You might be starting in the dark, early in the morning, and if itโs cold, youโll be tempted to start in a jacket. But if you take one layer off before you start moving, youโll avoid getting overheated as soon as you exert yourself with the uphill hiking. So โstart cold,โ and keep from having to shed a layer almost immediatelyโand probably breaking a sweat earlier than you need to. For my shirt layer, I love the Echo Hoodie. Itโs quick-drying and the loose hood protects my arms, neck, ears and head from that intense high-elevation sun. I also love layering an Echo Tee or Echo Tank with a super-light Optimist Sun Hoodyโor the Vigor Hybrid Hooded Jacket if it's chillier out. Itโs a perfect combo for going a little bit more light and fast. Pack a puffy for the summit. Even if it looks sunny and warm when youโre starting outโthe breeze will be cooler on top of the mountain. In fact, for every thousand feet of elevation you climb, the temperature will drop about three degrees. And who wants to be uncomfortable when you finally get to the top and see the view? Thatโs when you want to relax, take photos, and enjoy the most scenic snack spot! I always pack a down jacket like my Illuminate Down Hoody and usually put it on as soon as I get to the top, to hold in my warmth. If the weatherโs nice, I donโt want to feel rushed to hike down because Iโm cold. And since down jackets packs down tiny, thereโs no reason to leave them behind. Shop Women's Down and Insulated Jackets Always, always pack a rain jacket. Barring an accident or a lightning strike, getting soaked by a rainstorm on a 14er is one of the quickest ways to have your fantastic day go south. And since rain jackets, like the Helium II Jacket, weigh next to nothing, you can forget itโs even in your pack, until you actually need it. Itโs an insurance policy I donโt head up a 14er without. Plus, if weather gets really gnarly, you can layer it over your puffy. Shop Rain Collection Donโt forget your extremities! Itโs truly amazing what a pair of light gloves can do for morale. Even when I wear shorts, I pack a pair of Backstop Sensor Gloves or Overdrive Convertible Gloves, because when it gets chilly up high, I donโt want to be fumbling with my zippers or my snack wrappers with frozen fingers. In case my ears are cold, too, I pack a lightweight stocking cap, like the Wind Pro Hat. And Iโm almost always wearing my Performance Trucker Trail hat. Itโs streamlined and adjustable, so it doesnโt fly off my head like other truckers do in the wind. Itโs also quick to dry, keeps the sun out of my eyes, and keeps my flyaway hairs under control.