Things/Danas Tech Page
Things/Danas refers to Seirus’ innovative line of multifunctional knit tubes, which come in a variety of styles. These are: Sunthings®, Snowthings™, Sundanas™, and Snowdanas™.
Sunthings: A seamless, multifunctional knit tube that provides great UV protection (UPF 25). They are ultra-thin, wicking, and breathable. Able to be worn a bunch of ways, check out the video for just a few & come up with your own.
Snowthings: With an added fleece lining, the Snowthing™ provides both great sun protection (UPF 50+) with added warmth and comfort.
Sundanas: A Sunthing® with a stylish bandana cut.
Snowdanas: A Snowthing™ with a stylish bandana cut pack in your bag.
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.
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.
All Season
Versatile | Lightweight & Buildable Warmth | All Activities | All Climates
Reflective
Versatile | Midweight Warmth | Medium-Intensity Activities | Colder Climates
Performance
Performance | Max Wicking | Targeted Warmth | Medium to High-Intensity Activities
Winter Weight
Heaviest | Maximum Warmth | Low to Medium-Intensity Activities | Coldest Climates
Shop All
Coreshield™ Storm Layer Jacket
Coreshield™ Storm Layer Jacket
Mens Heatwave™ Performance Base Layer Crew Top
Mens Heatwave™ Performance Base Layer Crew Top
Women's Heatwave™ Performance Base Layer 1-4 Zip Crew Top
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
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
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
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
Men's Heatwave™ All Season Base Layer Crew Top
Women's Heatwave™ All Season Base Layer Bottoms
Women's Heatwave™ All Season Base Layer Bottoms
Men's Heatwave™ All Season Base Layer Bottoms
Men's Heatwave™ All Season Base Layer Bottoms
Mens Heatwave™ Performance Base Layer ¼ Zip Mock Neck Top
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
Mens Heatwave™ Performance Base Layer Quick Hoodie Top
Womens Heatwave™ Performance Base Layer Quick Hoodie Top
Womens Heatwave™ Performance Base Layer Quick Hoodie Top
Mens Heatwave™ Reflective Base Layer Top
Mens Heatwave™ Reflective Base Layer Top
Womens Heatwave™ Reflective Base Layer LS Top
Womens Heatwave™ Reflective Base Layer LS Top
Womens Heatwave™ Reflective Base Layer Bottoms
Womens Heatwave™ Reflective Base Layer Bottoms
Mens Heatwave™ Reflective Base Layer Bottoms
