Justin Simoni is an adventurer, athlete, and writer based in Boulder, Colorado. Known for establishing difficult lines in the mountains by bike and by foot, Simoni carefully balances the line between fortitude and foolishness in his ultra-endurance mountain missions. His first mountain bike race ever was the Tour Divide: a 2,700-mile self-supported race from Canada to Mexico through the Rocky Mountains, which he has now toed the line for twice. Being intrigued to not just ride around mountains but summit the peaks themselves, in 2014 Simoni went about creating his own bikepacking/mountain running challenge of summiting the 58 Colorado 14,000'+ peaks. In 2017, he repeated the feat, but this time doing the highest 105 peaks in the State of Colorado, taking two months to complete it. Simoni also enjoys long and lofty ridge traverses solely by foot, having traversed unsupported and alone the Mosquito/Tenmile Range, and the Sangre de Cristo Range. When not finding the absolute limit to his own personal endurance, Justin enjoys teaching, guiding, drinking good coffee, and petting every dog on the trail.
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The Best Base Layers
A solid base layer is at the core of keeping you warm, dry, and comfortable as you set out on your next great...![smartwool classic thermal merino 1/4 zip](https://d1nymbkeomeoqg.cloudfront.net/photos/29/38/415299_20426_M2.jpg)
Editors' Choice
Smartwool Classic Thermal Merino 1/4 Zip Review
This midweight base layer keeps you exceptionally warm with great breathability in a way that only 100% Merino wool...![merino.tech crew](https://d1nymbkeomeoqg.cloudfront.net/photos/31/13/432866_26458_M2.jpg)
Best Buy
Merino.tech Crew Review
A great value for 100% Merino, this base layer is perfect for taking the edge off cooler summer nights up high.![rei co-op midweight half-zip](https://d1nymbkeomeoqg.cloudfront.net/photos/29/38/415296_20247_M2.jpg)
Best Buy
REI Co-op Midweight Half-Zip Review
A warm synthetic base layer that just may well come close to the performance of wool at a price that we've found hard...![10 top slippers](https://d1nymbkeomeoqg.cloudfront.net/photos/29/67/418253_1945_M2.jpg)
10 Best Slippers
Our top loungers have found the best slippers to keep your feet warm and comfy, no matter if you're staying in to...![carhartt base force midweight crew](https://d1nymbkeomeoqg.cloudfront.net/photos/31/13/432868_17770_M2.jpg)
Best Buy
Carhartt Base Force Midweight Crew Review
A durable cotton/polyester blend top that breathes well and is also easy to clean and care for. We found it...![meriwool merino 250 long sleeve](https://d1nymbkeomeoqg.cloudfront.net/photos/26/64/387949_31034_M2.jpg)
Top Pick
Meriwool Merino 250 Long Sleeve Review
Merino wool is no longer synonymous with expensive, as this top shows. This 100% Merino base layer offers top-quality...![smartwool intraknit thermal merino](https://d1nymbkeomeoqg.cloudfront.net/photos/26/64/387941_3783_M2.jpg)
Top Pick
Smartwool Intraknit Thermal Merino Review
An almost futuristic knit-pattern and panels offers impressive ventilation and top-notch warmth, just wear this with...![best long underwear](https://d1nymbkeomeoqg.cloudfront.net/photos/27/21/393673_18149_M2.jpg)
The Best Long Underwear
With temperatures dropping, it's time to play outside in the cold. We've compared 13 of the best long underwear...![black diamond solution 150 merino half zip hoody](https://d1nymbkeomeoqg.cloudfront.net/photos/26/64/387948_32000_M2.jpg)
Top Pick
Black Diamond Solution 150 Merino Half Zip Hoody Review
This feature-rich, highly versatile base layer is perfect for integrating underneath your layering system, and...![best travel underwear](https://d1nymbkeomeoqg.cloudfront.net/photos/30/69/428382_21284_M2.jpg)
The Best Travel Underwear
Layering systems should be built from the foundation up, starting with a quality pair of underwear. They should be...![best slippers](https://d1nymbkeomeoqg.cloudfront.net/photos/29/57/417192_29135_M2.jpg)
The Best Slippers for Men
You'll wear good slippers nearly every day. We carefully tested (researching 30 models and purchasing 12 for direct...![best boxer briefs](https://d1nymbkeomeoqg.cloudfront.net/photos/30/69/428458_31669_M2.jpg)
The Best Boxer Briefs for Men
We tested the best men's boxer briefs from SmartWool, Under Armour, Tommy John, ExOfficio, Saxx, and more to find the...![best ultralight shelters](https://d1nymbkeomeoqg.cloudfront.net/photos/28/91/410673_20205_M2.jpg)
The Best Ultralight Tents
To bring you the best ultralight tent review, we've mostly focused on options weighing less than two pounds...![best sun protection shirts](https://d1nymbkeomeoqg.cloudfront.net/photos/30/46/426146_17410_M2.jpg)
The Best Sun Protection Shirts
Finding the right UPF-rated sun shirt can be a challenge. To help, we've picked the best options on the market and put...
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