Heatwave Base Layer | Seirus

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Heatwave Base Layer

[Reversible Base Layer](/content/collections/base-layer-reversible "Reversible Base Layer"/index.html)

What Powers Our Base Layers?

Heatwave™ Technology—the ultimate innovation in warmth, built to keep you comfortable no matter how cold it gets.

🔥 Reflective Stage – Reflects your body heat back to you, keeping warmth where you need it.

⚡ Kinetic Stage– Your movement fuels the heat, turning energy into extra warmth.

When combined, it’s like having your own personal heat engine— lightweight, powerful, and always working to keep you warm.

Loading image: Man in a running motion wearing Seirus base layer with a red glow around his top to show kinetic movement turning into energy

Loading image: Graph of Heatwave Technology showing reflected warmth, amplified heat and moisture-wicking travels through layers of material

Loading image: Guy on mountain in snowboard gear clapping snow together to create flurries

Find Your Perfect Base Layer

Shop Heatwave Base Layers

No matter where your adventures take you, our base layers are designed to keep you comfortable, dry, and ready for anything. Explore our styles to find the perfect fit for your activity and the weather ahead.

[Loading image: Women in all season base layer in rose gold

All Season

Versatile | Lightweight & Buildable Warmth | All Activities | All Climates

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[Loading image: Man in Reflective base layer set in charcoal

Reflective

Versatile | Midweight Warmth | Medium-Intensity Activities | Colder Climates

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[Loading image: Man in Performance Base Layer set

Performance

Performance | Max Wicking | Targeted Warmth | Medium to High-Intensity Activities

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[Loading image: Woman in winter weight base layer set

Winter Weight

Heaviest | Maximum Warmth | Low to Medium-Intensity Activities | Coldest Climates

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[Loading image: Coreshield Storm Layer Jacket

[Seirus Workwear/Safety **Coreshield™ Storm Layer Jacket**](/content/collections/view-all-base-layer/products/coreshield-storm-layer-jacket "Coreshield™ Storm Layer Jacket"/index.html)

[$249.99](/content/collections/view-all-base-layer/products/coreshield-storm-layer-jacket "Coreshield™ Storm Layer Jacket"/index.html)

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[Seirus **Mens Heatwave™ Performance Base Layer Crew Top**](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-base-layer-long-sleeve "Mens Heatwave™ Performance Base Layer Crew Top"/index.html)

[$129.99\ \ 3.0 /\ 5.0\ \ (5)5](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-base-layer-long-sleeve "Mens Heatwave™ Performance Base Layer Crew Top"/index.html)

[Loading image: Women's body mapped base layer long sleeve 1/4 zip top

[Seirus **Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top**](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-base-layer-long-sleeve-1-4-zip-top "Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top"/index.html)

[$134.99\ \ 3.8 /\ 5.0\ \ (5)5](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-base-layer-long-sleeve-1-4-zip-top "Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top"/index.html)

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[Seirus **Men's Heatwave™ Performance Base Layer Bottom**](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-full-length-bottom "Men's Heatwave™ Performance Base Layer Bottom"/index.html)

[$119.99](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-full-length-bottom "Men's Heatwave™ Performance Base Layer Bottom"/index.html)

[Loading image: Woman wearing base layer bottoms in carbon color

[Seirus **Women's Heatwave™ Performance Base Layer Bottom**](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-full-length-bottom "Women's Heatwave™ Performance Base Layer Bottom"/index.html)

[$119.99\ \ 4.0 /\ 5.0\ \ (1)1](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-full-length-bottom "Women's Heatwave™ Performance Base Layer Bottom"/index.html)

[Loading image: A man wearing a striped green and gray long-sleeve base layer crew top and matching pants standing with arms crossed against a white background.

[Seirus **Men's Heatwave™ Winter Weight Base Layer Crew Top**](/content/collections/view-all-base-layer/products/mens-heatwave-reversible-long-sleeve-crew-top "Men's Heatwave™ Winter Weight Base Layer Crew Top"/index.html)

[$99.99](/content/collections/view-all-base-layer/products/mens-heatwave-reversible-long-sleeve-crew-top "Men's Heatwave™ Winter Weight Base Layer Crew Top"/index.html)

[Loading image:

[Seirus **Women's Heatwave™ Winter Weight Base Layer Crew Top**](/content/collections/view-all-base-layer/products/womens-heatwave-reversible-long-sleeve-crew-top "Women's Heatwave™ Winter Weight Base Layer Crew Top"/index.html)

[$99.99\ \ 5.0 /\ 5.0\ \ (3)3](/content/collections/view-all-base-layer/products/womens-heatwave-reversible-long-sleeve-crew-top "Women's Heatwave™ Winter Weight Base Layer Crew Top"/index.html)

[Loading image: Man wearing Seirus Base Layers in black color

[Seirus **Men's Heatwave™ Winter Weight Base Layer Bottom**](/content/collections/view-all-base-layer/products/mens-heatwave-reversible-full-length-bottom "Men's Heatwave™ Winter Weight Base Layer Bottom"/index.html)

[$89.99\ \ 5.0 /\ 5.0\ \ (1)1](/content/collections/view-all-base-layer/products/mens-heatwave-reversible-full-length-bottom "Men's Heatwave™ Winter Weight Base Layer Bottom"/index.html)

[Loading image: Woman doing ballet jump in Seirus Base Layers

[Seirus **Women's Heatwave™ Winter Weight Base Layer Bottoms**](/content/collections/view-all-base-layer/products/womens-heatwave-reversible-full-length-bottom "Women's Heatwave™ Winter Weight Base Layer Bottoms"/index.html)

[$89.99\ \ 4.0 /\ 5.0\ \ (4)4](/content/collections/view-all-base-layer/products/womens-heatwave-reversible-full-length-bottom "Women's Heatwave™ Winter Weight Base Layer Bottoms"/index.html)

[Loading image: Woman stretching wearing the All Season Top and bottom in Carbom color

[Seirus **Women's Heatwave™ All Season Base Layer Top**](/content/collections/view-all-base-layer/products/womens-heatwave-lite-reversible-long-sleeve-top "Women's Heatwave™ All Season Base Layer Top"/index.html)

[$79.99](/content/collections/view-all-base-layer/products/womens-heatwave-lite-reversible-long-sleeve-top "Women's Heatwave™ All Season Base Layer Top"/index.html)

[Loading image: Man wearing Men's Heatwave™ Lite Reversible Long Sleeve Top

[Seirus **Men's Heatwave™ All Season Base Layer Crew Top**](/content/collections/view-all-base-layer/products/mens-heatwave-lite-reversible-long-sleeve-top "Men's Heatwave™ All Season Base Layer Crew Top"/index.html)

[$79.99\ \ 4.6 /\ 5.0\ \ (5)5](/content/collections/view-all-base-layer/products/mens-heatwave-lite-reversible-long-sleeve-top "Men's Heatwave™ All Season Base Layer Crew Top"/index.html)

[Loading image: Seirus All Season Top Layer Womens Rose Color

[Seirus **Women's Heatwave™ All Season Base Layer Bottoms**](/content/collections/view-all-base-layer/products/womens-heatwave-lite-reversible-full-length-bottom "Women's Heatwave™ All Season Base Layer Bottoms"/index.html)

[$74.99](/content/collections/view-all-base-layer/products/womens-heatwave-lite-reversible-full-length-bottom "Women's Heatwave™ All Season Base Layer Bottoms"/index.html)

[Loading image: Man putting his phone in Seirus Heatwave long bottoms

[Seirus **Men's Heatwave™ All Season Base Layer Bottoms**](/content/collections/view-all-base-layer/products/mens-heatwave-lite-reversible-full-length-bottom "Men's Heatwave™ All Season Base Layer Bottoms"/index.html)

[$74.99\ \ 5.0 /\ 5.0\ \ (1)1](/content/collections/view-all-base-layer/products/mens-heatwave-lite-reversible-full-length-bottom "Men's Heatwave™ All Season Base Layer Bottoms"/index.html)

[Loading image:

[Seirus **Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top**](/content/collections/view-all-base-layer/products/mens-heatwave-body-mapped-base-layer-long-sleeve-1-4-zip-mock-neck-top "Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top"/index.html)

[$139.99\ \ 5.0 /\ 5.0\ \ (2)2](/content/collections/view-all-base-layer/products/mens-heatwave-body-mapped-base-layer-long-sleeve-1-4-zip-mock-neck-top "Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top"/index.html)

[Loading image:

[Seirus **Women's Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top**](/content/collections/view-all-base-layer/products/womens-heatwave-body-mapped-base-layer-long-sleeve-1-4-zip-mock-neck-top "Women's Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top"/index.html)

[$139.99](/content/collections/view-all-base-layer/products/womens-heatwave-body-mapped-base-layer-long-sleeve-1-4-zip-mock-neck-top "Women's Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top"/index.html)

[Loading image: Man wearing quick hoodie top base layer in Camo color with the hood over his head

[Seirus **Mens Heatwave™ Performance Base Layer Quick Hoodie Top**](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-base-layer-quick-hoodie "Mens Heatwave™ Performance Base Layer Quick Hoodie Top"/index.html)

[$134.99\ \ 5.0 /\ 5.0\ \ (2)2](/content/collections/view-all-base-layer/products/mens-heatwave-mapped-base-layer-quick-hoodie "Mens Heatwave™ Performance Base Layer Quick Hoodie Top"/index.html)

[Loading image: Woman wearing quick hoodie top base layer in Camo color with hood and facemask on

[Seirus **Womens Heatwave™ Performance Base Layer Quick Hoodie Top**](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-base-layer-quick-hoodie "Womens Heatwave™ Performance Base Layer Quick Hoodie Top"/index.html)

[$134.99](/content/collections/view-all-base-layer/products/womens-heatwave-mapped-base-layer-quick-hoodie "Womens Heatwave™ Performance Base Layer Quick Hoodie Top"/index.html)

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