Thermoball

Thermoball

Developed in partnership with Primaloft, Inc., ThermoBall is a revolution in insulation technology. Unlike traditional continuous-filament synthetic insulation, the small, round PrimaLoft synthetic-fiber clusters closely mimic down clusters, trapping heat within small air pockets to retain warmth. Independent clo testing by Kansas State University has shown that ThermoBall has warmth equivalent to 600 fill goose down. As a result, ThermoBall can offer the lightweight warmth and compressibility of down with the wet-weather insulating performance of synthetic insulation.

Shop Thermoball

Exploration Without Compromise

Explore Without Compromise

We’ve made it easy to spot our most sustainable products on our website with our “Exploration Without Compromise” badge. To earn the badge, apparel, equipment, and accessories must be made with 75% or greater recycled, regenerative and/or responsibly-sourced renewable materials by weight. If the product has a DWR finish, it must be a non-perfluorinated chemicals (non-PFC) DWR.

Learn More

Related Products
Combining stretchability with 700-fill down insulation the slim-fit ...
Description:
Combining stretchability with 700-fill down insulation the slim-fit water-repellent Women's Stretch Down Vest can be worn as an inner or outer layer depending on the weather and your style.
Durable water-resistant boxy vest for lofty warmth inspired ...
Description:
Durable water-resistant boxy vest for lofty warmth inspired by the iconic design lines of our 1996 Nuptse Jacket. *Icon - Not eligible for Healthcare Worker or First Responder discounts.
The wind-resistant Women's Aconcagua Vest pairs natural and ...
Description:
The wind-resistant Women's Aconcagua Vest pairs natural and recycled synthetic insulations for a great warmth-to-weight ratio and a flattering fit.
Retro aesthetics and sustainably sourced fabrics are hallmarks ...
Description:
Retro aesthetics and sustainably sourced fabrics are hallmarks of our City Standard collection. The slim-fit and water-repellent Women's Insulated Vest is made with 100%-recycled body and lining fabrics. 70%-recycled Heatseeker™ Eco insulation completes this versatile sustainably conscious piece.