ContentsQUICK ANSWER – THE BEST LONG JOHNSLONG JOHNS REVIEWSPATAGONIA CAPILENE MID-WEIGHTARC’TERYX PHASE ARCRAFT ACTIVE EXTREMESMARTWOOL NTS MICRO 150ICEBREAKER WINTER ZONESMARTWOOL NTS MID 250MINUS33 MERINO WOOL KANCAMAGUS MID-WEIGHTDUOFOLD MEN’S MID-WEIGHTCARHARTT BASE FORCEUNDER ARMOUR COLDGEARCOMPARISON TABLE – THE BEST LONG JOHNSHOW TO CHOOSE THE BEST LONG JOHNSFABRICSYNTHETICSCOTTONMERINO WOOLSILKWEIGHTLIGHT-WEIGHTMID-WEIGHTHEAVY-WEIGHTFIT Planning on spending lots of time on the trails this winter? Looking for some extra warmth and comfort during your outdoor adventures? What you need is a good pair of long johns (aka thermal underwear). But do you know what are the best long johns for hiking? One of our big goals here at The Adventure Junkies is to help you gear up for the outdoors. In this article, we’ll walk you through how to choose the best long thermal underwear and show you our selection of the best models available. For more of our top hiking gear recommendations, check out these popular articles: Tents | Hammocks | Bivy Sacks | Tarps Sleeping Bags | Sleeping Pads | Stoves Backpacks | GPS | Headlamps | Poles| Watches Boots | Shoes | Sandals | Pants | Shorts Base Layers | Fleeces | Down Jackets | Rain Jackets LEARN HOW TO CHOOSE HIKING GEAR FOR YOUR NEXT ADVENTUREJOIN THE FREE HIKING GEAR COURSEJOIN THE FREE HIKING GEAR COURSE QUICK ANSWER – THE BEST LONG JOHNS Patagonia Capilene Mid-Weight Arc’teryx Phase AR Craft Active Extreme SmartWool NTS Micro 150 Icebreaker Winter Zone SmartWool NTS Mid 250 Minus33 Merino Wool Kancamagus Mid-Weight Duofold Mid-Weight Carhartt Base Force Under Armour ColdGear MULTI-DAYHIKING PACKING LISTDon't forget important gear at home!Print out this free hiking packing list to prepare for your next adventure.UNLOCK THIS LIST LONG JOHNS REVIEWS PATAGONIA CAPILENE MID-WEIGHT Check out the latest price on: Amazon | REI WOMEN’S VERSION: Patagonia Capilene Mid-weight MATERIAL: 97% polyester/3% spandex WARMTH: Medium FEATURES: Polartec Power Grid fabric, grid backing, bluesign approved fabric with 66% recycled polyester, permanent odor control, functional fly, brushed elastic waistband, chafe-free flatlock seams PROS: Made with recycled materials, odor control CONS: Size runs a bit large ARC’TERYX PHASE AR Check out the latest price on: Amazon | Backcountry WOMEN’S VERSION: Arc’teryx Phase AR MATERIAL: 100% polyester WARMTH: Medium FEATURES: Anatomical shaping for fit and comfort, gusseted crotch PROS: Durable, quick-drying, breathable, moisture-wicking, stretchy CONS: None that we could find CRAFT ACTIVE EXTREME Check out the latest price on: Amazon | Backcountry WOMEN’S VERSION: Craft Active Extreme MATERIAL: 100% polyester WARMTH: Medium FEATURES: Ergonomic fit, hexa-channel hollow core fibers for moisture transport, flatlock seams, 300% stretch PROS: Temperature control, very stretchable, moisture wicking, comfortable, great value for money CONS: None that we could find SMARTWOOL NTS MICRO 150 Check out the latest price on: Amazon | REI WOMEN’S VERSION: Smartwool NTS Micro 150 MATERIAL: 100% Merino wool WARMTH: High FEATURES: Chafe-free flatlock seams, merino wool, UPF 30 sun protection, functional fly, wide waistband PROS: Very warm, sun protection machine washable, doesn’t shrink when drying, lightweight CONS: Less durable than synthetic options ICEBREAKER WINTER ZONE Check out the latest price on: Amazon | REI WOMEN’S VERSION: Icebreaker Winter Zone MATERIAL: 97% Merino wool/3% lycra spandex WARMTH: High FEATURES: Zone panels for warmth and protection, soft elastic waistband, anti-chafing flatlock seams, lightweight merino mesh in gusset PROS: Very warm, flexible, controls temperature well CONS: Expensive SMARTWOOL NTS MID 250 Check out the latest price on: Amazon | REI WOMEN’S VERSION: Smartwool NTS Mid 250 MATERIAL: 100% Merino wool WARMTH: High FEATURES: UPF 50+ sun protection, covered elastic waistband, chafe-free flatlock seams, soft non-irritating merino wool PROS: Machine washable, sun protection, very warm, usable as a single layer in moderate weather and as a base layer in icy cold weather CONS: Pricey MINUS33 MERINO WOOL KANCAMAGUS MID-WEIGHT Check out the latest price on: Amazon WOMEN’S VERSION: Minus33 Merino Wool Franconia Mid-Weight MATERIAL: 100% Merino wool WARMTH: High FEATURES: 18.5 micron merino wool with interlock grid construction, anti-chafing flatlock seams, UPF 50+ sun protection, stretching cuffs, tagless label PROS: Sun protection, machine washable and dryable, odor resistant, very warm CONS: Merino wool wears down more easily than other fabrics DUOFOLD MEN’S MID-WEIGHT Check out the latest price on: Amazon WOMEN’S VERSION: Duofold Women’s Mid-Weight MATERIAL: 60% cotton/40% polyester WARMTH: High FEATURES: Pull-on closure, two-ply cotton blend, no-chafe flatlock seams, moisture-wicking waistband, tag-free PROS: Affordable, very warm, comfortable, durable CONS: Less breathable, less flexible CARHARTT BASE FORCE Check out the latest price on: Amazon WOMEN’S VERSION: Carhartt Base Force MATERIAL: 100% cotton WARMTH: High FEATURES: Moisture wicking fabric, stain breaker technology, reinforced stitching, rib-knit cuffs PROS: Thickness, warmth, durable, great value for money CONS: Less flexible UNDER ARMOUR COLDGEAR Check out the latest price on: Amazon | Backcountry WOMEN’S VERSION: Under Armour Women’s ColdGear Authentics MATERIAL: 87% polyester/13% elastane WARMTH: High FEATURES: Dual-layer fabric, ultra-warm brushed interior, fast-drying exterior, stretch-mesh gusset, inseam panels, 4-way stretch fabric, moisture transport system PROS: Super warm, great stretch, durable, comfortable CONS: None that we could find Gear up for hiking, without breaking the bankGet the Latest Deals on Hiking GearSent straight to your inbox...GEAR UP FOR HIKING COMPARISON TABLE – THE BEST LONG JOHNS PICTURELONG JOHNSBEST FORWARMTHPRICERATING PICTURELONG JOHNSBEST FORWARMTHPRICERATING Patagonia Capilene Mid-Weight OverallMedium$$ 5.0 Arc'teryx Phase AROverallMedium $$ 5.0 Craft Active Extreme OverallMedium$$ 4.5 SmartWool NTS Micro 150 Merino WoolHigh$$ 5.0 Icebreaker Winter Zone Merino WoolHigh$$$ 5.0 SmartWool NTS Mid 250 Merino WoolHigh$$$ 4.8 Minus33 Merino Wool Kancamagus Mid-WeightMerino WoolHigh$$ 4.7 Duofold Mid-Weight BudgetHigh$4.5 Carhartt Base Force BudgetHigh$4.5 Under Armour ColdGear BudgetHigh$4.4 HOW TO CHOOSE THE BEST LONG JOHNS FABRIC Just like base layer tops, long johns come in four different types of fabric—synthetics, cotton, wool and silk. All of them have their own characteristics and specifications. Choosing between materials is arguably the most important decision you’ll have to make. We’ll explain the pros and cons if each material below. SYNTHETICS Long johns made with synthetic materials are often cheaper. Synthetics include polyester and polyester blends, which can consist of spandex, nylon or polypropylene. These types of fabric are lightweight and soft, comfortable and wrinkle-resistant. They are tough and durable, which is an important factor to consider. The biggest downside of synthetic long johns is that they’re prone to absorb odors. If worn repeatedly and not cleaned regularly, they often begin to smell. COTTON Cotton is a material that’s both revered and criticized by outdoor enthusiasts. It has great characteristics, but also some that make it less ideal for outdoor activities. Cotton is a great insulator. It provides necessary warmth in cold weather and is a durable material. On the downside, however, cotton does not insulate when it gets wet. It dries very slowly, which poses dangers on the trail in winter. This is why it’s recommended to opt for long johns that are a mix of cotton and synthetics, rather than 100% cotton. MERINO WOOL Merino wool is essentially a fancy type of wool made with fine fibers of wool from a specific breed of sheep. This makes merino wool clothing a lot softer than clothes made with regular wool. Merino wool long johns are more expensive, but they’re also warmer, breathe better and dry more quickly. The only real downside of merino wool is that it’s a delicate material, so it is less durable than the synthetic and cotton options. It also requires special washing care. SILK Silk long johns are good for outings in moderately cold weather, but they won’t suffice when it gets extremely cold. They’re excellent for skiing and snowshoeing. Silk is lightweight and feels soft and luxurious. Cons are that it’s prone to abrasion and may absorb odors. WEIGHT Base layers are divided into different weight categories, which indicate their thickness. You will need to consider how you will layer your clothing and the lowest temperatures you will expect on your trip. LIGHT-WEIGHT Light-weight long johns are the thinnest and often the most affordable. They’re suitable for intensive activities in cold weather and regular use in warmer conditions. MID-WEIGHT Mid-weight long johns are considered to be the most multifunctional type. They’re good for moderately cold to cold weather and best used in fall and spring or with additional layers in winter. HEAVY-WEIGHT Heavy-weight long johns, also known as expedition-weight long johns, are the thickest type of underwear available. These types are usable in frigid and blustery conditions. FIT The best long johns are those that fit snugly but don’t restrict any movement. In cold weather, you want your base layers to be tight in order to better trap body heat. In warmer conditions, it’s better to opt for loose-fitting clothing, which allows for more air circulation. HIKING RESOURCESTABLE OF CONTENTSHIKINGTABLE OF CONTENTS 1. FUNDAMENTALS 5. HIKING TRAILS 2. HIKING GEAR 6. HIKING WITH KIDS 3. HIKING CLOTHING 7. HIKING WITH DOGS 4. CAMPING 8. WOMEN'S HIKING 1. FUNDAMENTALS 2. HIKING GEAR 3. HIKING CLOTHING 4. CAMPING 5. HIKING TRAILS 6. HIKING WITH KIDS 7. HIKING WITH DOGS 8. WOMEN'S HIKING Disclosure: The Adventure Junkies is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. This means if you click on the link and purchase the item, we will receive an affiliate commission at no extra cost for you. We also use other affiliate programs like REI, LeisurePro, Diviac and Liveaboard.com.