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Home Apparel Women Base & Mid Layers

Women’s Base & Mid Layers

Winter running starts with the right first layer. Our women's base and mid layers — merino or technical synthetics — wick moisture and retain heat to keep you training all winter. Smartwool, 2XU, Mizuno, Under Armour and more.

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  • Under Armour

    UA HeatGear Women's Compression Short Sleeve T-Shirt

    (1)
    $3495 CAD
    In stock

  • Under Armour

    UA HeatGear Armour - Long-Sleeved Compression Shirt for Women

    (1)
    $3995 CAD
    In stock
  • - 40%

    Smartwool

    Smartwool Intraknit Thermal Merino Base Layer Top for Women

    From $9597 CAD $15995
    In stock
  • - 40%

    Brooks

    Brooks Notch Thermal Hoodie 3.0 women's running shirt

    $5996 CAD $9995
    In stock
  • - 25%

    Smartwool

    Smartwool Classic Thermal Merino Base Layer 1/2 Zip for Women

    (1)
    $11996 CAD $15995
    In stock
  • - 45%

    Mizuno

    Mizuno Breath Thermo Long Sleeve Base Layer Top for Women

    $6322 CAD $11495
    In stock
  • - 40%

    Mizuno

    Mizuno Breath Thermo Half Zip Base Layer Top for Women

    (1)
    $7497 CAD $12495
    In stock

  • Smartwool

    Smartwool Intraknit Thermal Merino Base Layer Colorblock 1/4 Zip for Women

    $16995 CAD
    In stock
  • - 40%

    2XU

    2XU Light Speed 1/2 Zip Long Sleeve for Women

    $5397 CAD $8995
    In stock
  • - 40%

    Brooks

    Brooks Notch Thermal Hoodie Running Hoodie for Women

    (1)
    $5697 CAD $9495
    In stock
  • - 70%

    Saucony

    Saucony Omni Running Sportop for Women

    $3900 CAD $12999
    In stock
  • - 40%

    Mizuno

    Mizuno Infinity Running Hoody 1/4 zip for Women

    $7797 CAD $12995
    In stock
  • - 45%

    Inov-8

    Inov-8 AT/C Dri Release Short Sleeve Base Layer for Women

    $3024 CAD $5499
    In stock
  • - 40%

    Smartwool

    Smartwool Merino 250 Base Layer 1/4 Zip for Women

    (2)
    $8997 CAD $14995
    Low stock
  • - 30%

    2XU

    2XU Ignition 1/4 Zip Long Sleeve Top for Women

    $6997 CAD $9995
    In stock
  • - 30%

    2XU

    2XU Light Speed 1/2 Zip Long Sleeve Top for Women

    $5597 CAD $7995
    In stock

Women's base and mid layers for running

Running comfortably in the cold starts with a well-planned layering system. Our women's base and mid layers — in merino wool or technical synthetic fabrics — manage moisture, retain heat and let you keep training all winter, without overheating or chills.

Understanding the layering system

The base layer: managing moisture

Worn directly against the skin, the base layer wicks sweat to keep you dry. It's the most important piece in cold weather: dry skin is warm skin. Go for a fitted, close-to-the-body cut.

The mid layer: retaining heat

Over the base layer, the mid layer (long-sleeve top, half-zip, technical sweatshirt) traps heat while letting the whole system breathe. In deep cold, add a windproof running jacket as the outer layer.

Merino or synthetic: which to choose?

Merino wool

Smartwool merino base layers naturally regulate temperature, stay warm even when damp and resist odours — ideal for long winter runs.

Technical synthetics

2XU thermal compression tops support the muscles while wicking sweat, Mizuno's Breath Thermo generates heat on contact with moisture, and Under Armour pieces excel in the cold. Fast-drying, perfect for intense efforts.

Dressing for the temperature

Golden rule: dress as if it were about 10 degrees warmer, because effort warms you up fast. Between 0 and -10°C: a base layer plus a mid layer is often enough. Below -10°C: add a windproof outer layer and protect your extremities with our winter running accessories. Also consider women's winter running shoes for grip on snow and ice.

Complete your women's running outfit

Explore the rest of our women's running apparel:

Looking for the men's equivalent? Discover our men's base and mid layers.

Frequently asked questions

What's the difference between a base layer and a mid layer?
The base layer is worn against the skin and manages moisture to keep you dry. The mid layer goes over it and adds thermal insulation. Together they form the foundation of an effective cold-weather layering system.
Merino or synthetic for the base layer?
Merino naturally regulates temperature, stays warm even when damp and resists odours — ideal in cool to cold weather. Synthetic is lighter, dries faster and suits intense efforts. The choice depends on your runs and preferences.
How do I dress for the temperature in winter?
Golden rule: dress as if it were about 10°C warmer, since effort warms you fast. Between 0 and -10°C, a base layer and a mid layer are often enough; below -10°C, add a windproof outer layer.
Can I wear a base layer on its own?
Yes, in cool weather (5 to 12°C), a breathable long-sleeve base layer is often enough on its own. As it gets colder, pair it with a mid layer, then a protective jacket.
How do I care for technical layers and merino?
Wash in cold water, without fabric softener (it clogs the fibres). For merino, use a gentle soap and dry flat. Air drying preserves elasticity and thermal properties.