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Base Layer

Base Layers

Set yourself up for all-day comfort with adidas base layers. From merino leggings to moisture-wicking tees, these essentials keep you moving with confidence.

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adidas Base Layers

Extend your comfort range in cool weather with versatile base layers. Our performance under layers add warmth and manage sweat to keep you comfortable through a wide range of temperatures and activities. Run, hike, walk or ski, you can count on the proven performance of technologies like adidas AEROREADY and Clima. Lightweight, quick-drying knits let your body breathe while trapping warmth to keep you comfortable and focused on your workout. Trail, road or track, runners will find long and short shirts that regulate your temperature and manage odor. Make the most of every workout with base layers that match the weather and your effort.

Spring, summer, winter and fall. Every season is the right season to focus on your training. Layer up to match the weather with the best long underwear to keep you outside, on the move and comfortable from start to finish. In cold weather, Terrex thermal layers wick moisture for quick-drying comfort throughout your workout. Choose from all-natural merino wool tops and bottoms in different weights to match the temperature and your effort. Merino layers offer four-season versatility, thanks to the natural breathability and climate control of wool. Shop tanks, crewnecks, tights and 3/4-length leggings. Discover lightweight base layers with multi-sport versatility today.

Base Layers Frequently Asked Questions

What does a base layer do?

Base layers are garments worn closest to the skin, providing insulation, moisture management and temperature regulation. They are essential for outdoor activities like hiking, skiing and running. Base layers can be made from various materials, including wool, synthetic fibers and merino wool, each with its own benefits and drawbacks.Wearing a base layer helps keep your body warm by trapping a thin layer of air close to your skin, which acts as insulation. These layers also wick away sweat, pulling moisture from your skin to the outer surface of the fabric so you stay dry even when you are working hard.

What is the difference between thermals and base layers?

Thermals and base layers are often used interchangeably, but there can be subtle differences that matter when you are getting dressed for cold weather. Base layers are specifically designed to be worn closest to the skin. Their main job is to provide moisture-wicking properties, so sweat moves away from your body instead of soaking in, which helps with temperature regulation and keeps you feeling dry even during active workouts or long days outside. Thermals can be a type of base layer, but the term “thermals” may refer to any garment that provides warmth, including thicker, heavier-weight options that might not be as comfortable for wearing directly against the skin. Knowing the difference helps you pick the right layer for your activity, so you get the benefits of warmth and comfort without overheating or feeling damp.

Do base layers need to be tight?

Base layers should generally be a snug fit, but not overly tight. A close fit allows the fabric to wick away sweat and moisture from your skin, which keeps you dry and comfortable during workouts or cold weather activities. If the base layer is too tight, you might notice that your range of motion is limited. But if your base layer is too loose, it will not trap warmth as efficiently and might bunch up. Aim for a fit that follows your body’s shape but does not pinch or bind, so you get the benefits of warmth and moisture control without sacrificing comfort or flexibility.