Best Womens Athletic Active Base Layers in 2026

FEATURES: Quick Dry, Anti-Odor, 4-Way Stretch, Lightweight, Breathable, Ultra-Soft, Fitted, Tag Free Label. Perfect for your basic needs and everyday activities. Offers maximum stretch while being lightweight, comfortable, and snug fitting. Make this your go-to thermal bottom as your first layer on a long run or your only layer while lounging on the couch or sleeping at night.

FABRIC: 90% Polyester, 10% Spandex. Lightweight knit with a lot of stretch. Lightly brushed on both sides which gives a soft cozy feel that is smooth against the body.

COLD WEATHER: Lightweight warmth, can be worn invisibly as first layer underneath any other clothing.

Machine wash cold, Import

Ready for Adventure: Always enjoy cold weather adventures with the Icebreaker Merino Women’s 175 Standard Merino Wool Shirt! These women’s thermals are long sleeve and feature a comfortable crew neck for year-round layering performance and style.

Amazingly Soft Women’s T-Shirts: These long sleeve tee shirts for women are made with 100% Merino Wool, an annually renewable resource that naturally resists odors, regulates body temperature in all weather conditions, and helps manage moisture.

All Day Comfort: Breathable and versatile, this women’s long sleeve tee shirt is quick-drying, with offset shoulder seams to reduce chafing, and ribbed fabric for all day comfort ; This is a slim fit long sleeve shirt for women for classic style.

TSLA Thermal Shirt Series designed for cold weather.

[Materials] Mix of Polyester & Spandex fabric is excellent elasticity with enhanced range of motion.

[Fleece Lining] Thermal fleece lining designed to enhance the warmth and thermal insulation.

Material: Soft, Sleek, Lightweight, Breathable Polyester Fabrics

Quick Dry:Breathable, Lightweight, Quick-Drying Fabric Actively Wicks Moisture Away from the Skin, Keep You Cool and Dry and Comfy in Running, Hiking.

UV Protection: The Fabric Rating UPF 50+ Protects Your Skin from the Harmful UVA/UVB Rays, Keeping You Cool.

MIDWEIGHT – Womens Wool Base Layer Top Available in: Midweight = 250 g/m², Heavyweight = 320 g/m². FREE MERINO WOOL HIKING SOCKS ($21 VALUE!) – Package includes Merino Wool Zip Sweater Women Midweight 250 g/m² + Wool Socks. Cool Packaging! MAKES A GREAT GIFT!

SUPER SOFT & COMFORTABLE – 100% Superfine 18.5 Micron Zip Up Wool Sweater for Women provides all day comfort and no itch! Designed for daily wear without rubbing, overheating, or bunching of regular cotton.

MOISTURE WICKING & ODOR RESISTANT – Womens Quarter Zip Wool Sweater natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.

UA Base 2.0 Active Baselayer is lightweight, flexible & breathable for high activity performance in cool conditions

UA Scent Control Technology to keep you undetected in all pursuits

Soft, brushed grid interior traps air against your skin, closely managing your body's microclimate to keep you warm & comfortable

FEATURES -- Quick Dry, Anti-Odor, 4-Way Stretch, Lightweight, Breathable, Ultra-Soft, Fitted, Tag-Free -- Perfect for your basic needs and everyday acitivities. Offers maximum stretch while being lightweight, comfortable, and snug fitting. Make this your go-to legging as your first layer on a long run...or your only layer while lounging on the couch or sleeping at night.

FABRIC -- 90% Polyester, 10% Spandex -- Lightweight knit with a lot of stretch. Lightly brushed on both sides which gives a soft cozy feel that is smooth against the body. Quick dry technology wicks away all moisture leaving you comfortable and dry. 4-way stretch moves with your body allowing for full freedom of motion and comfort.

LOUNGING -- Perfect for lounging around at home. Or as tight fitted top bottom for sleeping. Spandex adds additional stretch for full range of motion and comfort. ***Please note this shirt is tight fitting, so if you want a looser fit you should buy 1 size up.***

Moisture-Wicking Fabric: Made of 85% microfiber polyester and 15% spandex with Silvadur Intelligent Freshness, our thermal shirts for women help control odor to keep you fresh and dry

Athletic Fit: The perfect long-sleeve baselayer shirt for women, the Quest features a tagless design, flat seams for a smooth and close ultra-comfortable fit

Efficient Design: Long-sleeve undershirt for women features raglan sleeves with thumbhole cuffs for easy layering; Drop tail maintains coverage without restricting freedom of motion

Super-light HeatGear fabric delivers superior coverage without weighing you down

Material wicks sweat & dries really fast

Strategic mesh panels for added breathability

MATERIAL: Polyester, Silky-soft, Stretchy, Lightweight, Breathable And Comfortable.

QUICK DRY : Breathable and lightweight moisture wicking fabric pulls moisture away from the skin, which keeps you cool and dry.

SPECIAL REFLECTIVE STRIP DESIGN: Reflective Strip Design on both Arm, Provide Visibility at the Low-Light Conditions and Help You More Safety on the Night Running.

Soft, comfy, lightweight and feels great against your skin, this turltneck t-shirt will give you a comfy and breezy wearing experience. You will stay comfy all day with the cute shirt

Women's basic turtleneck long sleeve tops are great stretchy, slim fit, easy to fit any body figure. A great option for everyday wear or as a underscrubs piece or loungewear at home

The turtleneck is lightweight, which makes it very comfortable to wear under a few layers, but it's also warm enough that you can wear it alone

FABRIC: Polyester Skin-Friendly Fabric, Breathable , Light Weight, Soft, Comfy To Your Touch

QUCK DRY: Breathable, Lightweight, Quick-Drying Fabric Actively Wicks Moisture Away from the Skin, Keep You Cool and Dry

SUN PROTECTION: The Fabric Rating UPF 50+ Can Efficiently Block Harmful Rays to Protects Your Skin, Allowing You to Enjoy Outdoor Sports Safely

Moisture-Wicking Fabric: Constructed of 85% technical fiber polyester and 15% spandex, these thermal leggings for women also feature Intellifresh(tm) Powered by Silvadur(tm)

Athletic Fit: The perfect long-sleeve workout shirts for women, our women’s thermals feature a tagless design and flat seams for a smooth, ultra-comfortable fit

Efficient Design: Long-sleeve undershirt for women features a quarter-zip mock turtleneck, hemmed cuffs with thumbholes for easy layering; Drop tail maintains coverage without restricting freedom of motion

【Breathable & Quick-dry】This cycling undershirt designed with big hole mesh, high moisture wicking and venting. Which can quickly removes sweat from your body and helps you stay comfortable and dry during cycling sessions

【 Sleeveless Ergonomic Fit】Special sleeveless cutting let the singlet can be wearing as a layer under any sport clothes.

【Premium Material】lightweight and compression, the high stretch baselayer will give you high performance and exceptional comfort without any itching feelings

UA Base 2.0 Active Baselayer is lightweight, flexible & breathable for high activity performance in cool conditions

UA Scent Control Technology to keep you undetected in all pursuits

Soft, brushed grid interior traps air against your skin, closely managing your body's microclimate to keep you warm & comfortable

【Feature】- Hitting the gym? Our full-length and cropped leggings will wick away sweat as you train with zoned compression. When feeling nothing is everything. YIVISE Womens Workout Collection. From shorts and leggings to sweatpants and trousers, our women's bottoms are here for you whether you're running, training, stretching or relaxing. Max out your stride in loose-fitting shorts with pockets for storage, or focus on your yoga practice in a tighter pair that will free you from distraction.

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4-way stretch fabric enhances comfort and mobility

Insulating and wind resistant material keeps the heat in and the cold out

Wicking technology pulls moisture away from the body, leaving you drier and warmer

NORDIC PERFORMANCE: Designed in Sweden - a land blessed with 200 days of challenging conditions. Our highly functional Active Intensity Pants are built for dedicated athletes who work out with a purpose.

INNOVATIVE: Keeps you dry and comfortable during intensive training in medium cold to cold temperatures.

FUNCTIONAL: Stretchy, soft material with seamless construction, zone-adapted design and ergonomic fit.

【Feature】- Hitting the gym? Our full-length and cropped leggings will wick away sweat as you train with zoned compression. When feeling nothing is everything. YIVISE Womens Workout Collection. From shorts and leggings to sweatpants and trousers, our women's bottoms are here for you whether you're running, training, stretching or relaxing. Max out your stride in loose-fitting shorts with pockets for storage, or focus on your yoga practice in a tighter pair that will free you from distraction.

【Feature】- high waisted active shorts black shorts tight shorts mens jersey shorts white high waisted bell bottom jeans corduroy shorts designer shorts hot yoga pants baggy shorts high rise shorts ripped jean shorts boyfriend shortsripped denim shorts yoga pants linen shorts romper shorts jumpsuit shorts mini shorts tight yoga pants shorts knit shorts petite sweatpants black shorts walking shorts hot shorts leggings shorts white jean shorts bikini workout pants vintage shorts tactical shorts

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ACTIVE FIT - Designed to follow the lines of the body, usually with some amount of stretch fabric. These garments have a lighter feeling fit, with less bulk than a relaxed fit thermal base layer. They are especially perfect for year round, multipurpose use under layers.

UPF 40+ - Ultraviolet Protection Factor. Sunlight includes rays of ultraviolet (UV) radiation, and Hot Chillys products are designed to help protect you!

WARMTH FACTOR 10/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is. Warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities.

Body mapped with different structures for optimal thermoregulation

Lightweight and warming yarn for optimal thermoregulation

Keeps you body dry and comfortable by the excellent wicking effect

UV Protection - With UV protection of UPF50+

Sun Blocking, Lightweight, Breathable, Quick Dry

Lightweight - Easy to pack and go. Great for traveling

ACTIVE FIT - Designed to follow the lines of the body, usually with some amount of stretch fabric. These garments have a lighter feeling fit, with less bulk than a relaxed fit thermal base layer. They are especially perfect for year round, multipurpose use under layers.

UPF 40+ - Ultraviolet Protection Factor. Sunlight includes rays of ultraviolet (UV) radiation, and Hot Chillys products are designed to help protect you!

WARMTH FACTOR 10/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is. Warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities.

ACTIVE FIT AND UPF 40+ - Designed to follow the lines of the body, usually with some amount of stretch fabric. These garments have a lighter feeling fit, with less bulk than a relaxed fit thermal base layer. They are especially perfect for year round, multipurpose use under layers. Ultraviolet Protection Factor. Sunlight includes rays of ultraviolet (UV) radiation, and Hot Chillys products are designed to help protect you!

MECHANICAL STRETCH. Engineered to stretch and move with you, providing all over fit, warmth and expedited moisture movement.

WARMTH FACTOR 10/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is. Warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities.

UV Protection - With UV protection of UPF50+

Sun Blocking, Lightweight, Breathable, Quick Dry

Lightweight - Easy to pack and go. Great for traveling

【Match】Active Base Layers/Active Hoodies/Active Pants/Active Shirts Tees/Button-Down Shirts/Polos/T-Shirts/Tank Tops/Active Shorts/Active Sweatshirts/Active Underwear/Athletic Socks/Base Layers Compression//Dresses/Casual/Club Night Out/Cocktail/Formal/Wedding Dresses/Work/Leggings/Sets/Skirts Skorts/Sweaters/Track Active Jackets/Vests/Bodysuits/Coats, Jackets & Vests/Dresses/Fashion Hoodies & Sweatshirts/Jeans/Jumpsuits, Rompers & Overalls

【Match】-Men's Activewear Collection is here for you whether you're running, training, stretching or relaxing. #Activewear Tops/Active Base Layers/Active Hoodies/Active Pants/Active Shirts Tees/Button-Down Shirts/Polos/T-Shirts/Tank Tops/Active Shorts/Active Sweatshirts/Athletic Socks/Base Layers Compression/Activewear Bottoms/Leggings/Sports Bras/Biker Shorts/Sets/Working Out /Yoga /Leggings/Hiking /Sweatsuit/Full-Length/7/8/Cropped Sweatpants/Shorts/Skorts

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Material: 52% merino wool, 21% Tencel, 20% polyester, 7% spandex

Insulation Weight: midweight

Fit: form-fitting

WARM WEATHER APPAREL. Work up a sweat but still feel cool in this short sleeve tee. It combines the benefits of Merino wool—thermoregulation, moisture-wicking and moisture management—with Tencel performance fabric for soft, lightweight comfort.

REGULAR FIT. Designed to meet the demands of outdoor adventuring, this regular fit base layer t-shirt offers room to move throughout the silhouette without any additional bulk.

ACTIVE ULTRALITE MERINO. Best for warm weather and blended from Merino and Tencel, this performance fabric is designed to help you stay cool and comfortable while working up a sweat — combining breathability and quick dry times.