Longjohns

A fast-drying base layer for walkers who value moisture control over outright warmth. Patagonia says:  Our lightest and fastest drying baselayer for minimalist warmth management in cool conditions...

Lightweight leggings that utilise the incredible properties of Merino wool to insulate and regulate your body.  Rab says:  Warm, breathable, form fitting leggings ideal as a baselayer on cold mountain

A minimalist design for cold-weather active insulation. It provides warmth while being highly breathable and focused on wicking moisture and regulating body temperature during exercise. OMM...

Quick-drying comfort for cooler days Turbat says:  In the continuation of the Hike Lite series, we are adding the bottom part. Elastic and light material that has proven itself in previous seasons...

UOG TOP PICK:  Light, durable, and naturally comfortable, the Montane Malli Leggings blend Merino performance with synthetic strength — a top choice for mountain layering and multi-day use. Montane...

Technical warmth and precision fit for demanding alpine conditions. Mammut says:  The ideal base layer for next-to-skin comfort during intense winter climbing. Tested by athletes as part of our Eiger...

A warm, breathable base layer for cooler days and slower-paced winter use. Patagonia says:  Our most versatile baselayer wicks sweat and provides balanced warmth in a wide range of winter conditions...

These comfortable winter long johns are brilliant for a winter base layer or as part of your sleep system. Icebreaker says:  The benchmark against which all others are judged, the 200 Oasis Legless...

Montane Dart XT Long Johns are premium thermal baselayer bottoms for high-exertion activities in cold weather. They're made from Montane's Apex Thermo Eco recycled polyester fabric and have excellent...

The Mountain Equipment Eclipse Pants offer core warmth, wick moisture, breathe well, and dry quickly, making them ideal for high-output activities like climbing and skiing. Mountain Equipment...

The classic, go-anywhere all-around baselayer, made with 100% recycled content. The smooth, soft face makes for easy layering; hollow-core yarns and a diamond-grid back trap warm air, wick moisture...

Patagonia's Capilene Theramal Weight Bottoms are warm, breathable polyester baselayers with minimal bulk. Polartec Power Grid fabric with Polygiene permanent odor control. Fair Trade Certified sewn. ...

A soft, warm merino baselayer that works particularly well for multi-day trips and year-round sleeping. Icebreaker says:  Our best-selling base layer bottoms made from soft and breathable 100% merino...

Lightweight warmth and flexibility for cold-weather pursuits. Rab says:  Made with exceptionally warm, fast-drying Thermic™ Stretch Pro fabric, these lightweight fleece tights offer a boost of warmth...

Warm, close-fitting thermal bottoms for cold, low-activity conditions Turbat says:  Warm men's thermal pants, designed for sedentary and static use in the cold period. They are very elastic, fit well...

High-quality mountain runners’ legwear that protects from the harsh winter cold. Made from durable materials, they have a comfortable fit and various features that make them ideal for mountain...