Thermal Base Layer Pants

Thermal base layer pants are your go-to solution for staying warm and comfortable during chilly outdoor adventures. Perfect for layering under your favorite hiking or skiing gear, these pants offer the versatility and durability needed to withstand the cold while maintaining a snug fit that moves with you. Whether you're heading out for a brisk winter hike or enjoying a cozy evening by the campfire, thermal base layer pants provide lasting value and comfort, making them an essential addition to your outdoor wardrobe. Embrace the great outdoors with confidence and ease, knowing you're well-equipped to enjoy every moment, no matter the temperature.

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Men's Double-Layer Underwear, Pants

A pair of dark indigo thermal pants with a wool blend exterior and soft cotton interior.
Men's Cresta Midweight 250 Pants

A versatile base layer made of itch-free merino wool, wicking sweat and resisting odor in dark black.

Pros: Great color Versatile use Soft and lightweight Excellent warmth Comfortable fit
Women's PrimaLoft ThermaStretch Fleece Pocket Tights, Mid-Rise

A pair of mid-rise black tights with plush fleece interior, moisture-wicking waistband, and handy pockets.

Pros: Handy pockets Warmth Softness Comfortable Good fit
Women's PrimaLoft ThermaStretch Fleece Tights, Mid-Rise
Price was from: $110 now: $54.99

A pair of mid-rise fleece/nylon tights in forest shade, featuring PrimaLoft® fabric and a plush interior.

Pros: Great fit Quality Warmth Softness Comfortable
Women's Cresta Midweight 250 Pants, High-Rise Slim-Leg

An eggplant heather, high-rise slim-leg base layer made of 100% merino wool for warmth and comfort.

Pros: Great fit Perfect base layer Warm and cozy Comfortable fabric Non-itchy material
Men's L.L.Bean Heavyweight Base Layer Pant

A midnight black heavyweight base layer pant made from recycled polyester, perfect for warmth and moisture-wicking.
Men's Cresta Wool Ultralight 150 Pants

An ultralight base layer made of 100% merino wool, offering warmth and odor resistance in alloy gray.

Pros: Stylish design Lightweight feel Durable material Warm without bulk Comfortable fit
Women's Cresta Ultralight 150 Pants, High-Rise Slim-Leg

A high-rise, slim-leg base layer made of 100% merino wool, offering warmth and comfort in alloy gray.
Women's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking synthetic base layer pant in dark black, perfect for everyday warmth and layering.

Pros: Adds extra warmth Lightweight Very soft Good fit Comfortable
Men's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking base layer pant in dark black heather, made from a polyester-spandex blend.

Pros: Ideal for layering Provides warmth Lightweight feel
Women's Cresta Ultralight 150 Pants, High-Rise Slim-Leg Stripe

A lightweight, high-rise slim-leg base layer made of soft, itch-free 100% merino wool in striped patterns.
Men's L.L.Bean Heavyweight Base Layer Pant, Print

A heavyweight base layer pant in kelp green camo, made from recycled polyester for warmth and moisture-wicking.
Women's L.L.Bean Heavyweight Base Layer Pants

A versatile, midnight black heavyweight base layer with moisture-wicking, quick-drying, and odor-controlling properties.
Men's Cresta Wool Ultralight 150 Pant, Stripe

A slim-fit, itch-free 100% merino wool base layer pant in regatta blue for cold-weather activities.
Women's L.L.Bean Midweight Base Layer Pants

A versatile midweight base layer pant in carbon navy, made from recycled polyester and elastane.
Men's L.L.Bean Midweight Base Layer Pants

A versatile midweight base layer with REPREVE® recycled polyester, offering moisture-wicking and quick-drying comfort.
Women's Silk Underwear, Pants

A lightweight, warm, and breathable pair of black silk long underwear pants for women.

Pros: Lightness Comfort Warmth Softness Versatility
Men's Two-Layer Union Suit

A supersoft, charcoal union suit with a wool blend for warmth and a roomy fit for comfort.

Pros: Functional Fits well Well-made Warmth Comfortable
Men's Silk Underwear, Pants

A strong, lightweight pair of black silk pants offering warmth and comfort without added bulk.

Pros: Great fit Warmth Comfortable Well made Versatile for weather
Women's NRS HydroSkin 0.5 Pant

A form-fitting, insulating pant with 0.5 mm neoprene for cool-weather water sports in black or graphite.

Thermal Base Layer Pants

When the air turns crisp and the days grow shorter, staying comfortable outdoors starts with the right foundation. Thermal base layer pants are a staple for anyone who loves to make the most of every season, whether you’re heading out for a brisk morning hike, building snow forts with the kids, or simply shoveling the driveway before work. Their versatile design and reliable warmth make them a favorite for both outdoor adventures and everyday moments, offering the comfort you need to keep moving, even when the temperature dips. With soft, stretchable fabrics that move with you, these base layers are crafted to be worn under everything from ski pants to jeans, giving you the flexibility to layer up or down as conditions change. Many people appreciate the way thermal base layer pants wick away moisture, helping you stay dry and comfortable no matter how active your day gets. It’s that dependable feeling—knowing you’ll stay warm from the first frosty step outside to the last log on the fire—that makes these pants a cold-weather essential.

Choosing the right pair comes down to a few key considerations. Think about the activities you’ll be enjoying: Are you planning a weekend camping trip, or do you need something to keep you cozy during the morning dog walk? The best thermal base layer pants balance warmth and breathability, so you won’t overheat when you’re on the move. Look for features like flat seams that help prevent chafing, and a fit that’s comfortable under your favorite pants or snow gear. Some styles offer extra stretch for ease of movement, while others focus on classic, timeless comfort that works for everyone in the family. These pants also make a thoughtful gift—perfect for anyone who spends time outdoors, from the avid skier to the backyard birdwatcher, or even someone who just appreciates the comfort of an extra layer on chilly evenings at home. As August winds down and you start preparing for the cooler months ahead, adding a few pairs of thermal base layer pants to your wardrobe ensures you’ll be ready for whatever fall and winter bring your way.

Whether you’re shopping for yourself or searching for a practical gift, there’s a style and weight of thermal base layer pants to suit every need. From lightweight options that work well under office attire to heavier layers designed for the coldest days on the trail, you’ll find plenty of choices to keep you comfortable and warm. And while you’re exploring your options, don’t forget to check out our Men's Thermal Base Layers page for even more inspiration and details on what makes these pants such a reliable part of any cold-weather wardrobe. With the right base layers, you can look forward to spending more time outside, savoring every moment of the changing seasons in lasting comfort.