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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.

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

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

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.

Women in all season base layer in rose gold

All Season

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

SHOP

Man in Reflective base layer set in charcoal

Reflective

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

SHOP

Man in Performance Base Layer set

Performance

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

SHOP

Woman in winter weight base layer set

Winter Weight

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

SHOP

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Seirus Workwear/Safety

Coreshield™ Storm Layer Jacket

Coreshield™ Storm Layer Jacket

Mens Heatwave™ Performance Base Layer Crew Top

5

Mens Heatwave™ Performance Base Layer Crew Top

Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top

5

Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top

Men's Heatwave™ Performance Base Layer Bottom

Men's Heatwave™ Performance Base Layer Bottom

Women's Heatwave Performance Base Layer Bottom

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Women's Heatwave Performance Base Layer Bottom

Men's Heatwave™ Winter Weight Base Layer Crew Top

Men's Heatwave™ Winter Weight Base Layer Crew Top

Women's Heatwave™ Winter Weight Base Layer Crew Top

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Women's Heatwave™ Winter Weight Base Layer Crew Top

Men's Heatwave™ Winter Weight Base Layer Bottom

Men's Heatwave™ Winter Weight Base Layer Bottom

Women's Heatwave™ Winter Weight Base Layer Bottoms

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Women's Heatwave™ Winter Weight Base Layer Bottoms

Women's Heatwave™ All Season Base Layer Top

Women's Heatwave™ All Season Base Layer Top

Men's Heatwave™ All Season Base Layer Crew Top

5

Men's Heatwave™ All Season Base Layer Crew Top

Seirus All Season Top Layer Womens Rose Color

Women's Heatwave™ All Season Base Layer Bottoms

Women's Heatwave™ All Season Base Layer Bottoms

Men's Heatwave™ All Season Base Layer Bottoms

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Men's Heatwave™ All Season Base Layer Bottoms

Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top

2

Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top

Women's Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top

Women's Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top

Mens Heatwave™ Performance Base Layer Quick Hoodie Top

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Mens Heatwave™ Performance Base Layer Quick Hoodie Top

Womens Heatwave™ Performance Base Layer Quick Hoodie Top

Womens Heatwave™ Performance Base Layer Quick Hoodie Top

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Man standing holding his arms out wearing mens grey reflective base layer top and bottoms

Mens Heatwave™ Reflective Base Layer Top

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Mens Heatwave™ Reflective Base Layer Top

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women standing with her hand on hip wearing womens grey reflective base layer top and bottoms

Womens Heatwave™ Reflective Base Layer LS Top

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Womens Heatwave™ Reflective Base Layer LS Top

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women facing the back corner of the shot looking over her shoulder wearing womens grey reflective base layer top and bottom

Womens Heatwave™ Reflective Base Layer Bottoms

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Womens Heatwave™ Reflective Base Layer Bottoms

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Man standing with hands on hips wearing mens grey reflective base layer top and bottom

Mens Heatwave™ Reflective Base Layer Bottoms

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Mens Heatwave™ Reflective Base Layer Bottoms

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