It's been around for decades, but hard to find. It works as well as cellulose and is easy to install.
UltraTouch™ Denim Insulation « Bonded Logic
Recycle Your Denim - Blue Jeans Go Green Program
Use and Reuse - Levi Strauss & Co : Levi Strauss & Co
Recycle Your Denim - Blue Jeans Go Green Program
How to Recycle Your Clothing: Tips for a Sustainable Lifestyle
The Lycra Company Strive for Sustainable, Market-Leading Innovations – WWD
The Blue Jeans Go Green Program - Denim Recycling Program
Circular Fashion: A Look at Cotton Incorporated's Blue Jeans Go Green™ Recycling Program - CottonToday
MADE L.A.: 7 Things We Learned About Sustainable Fashion and Beauty – The Hollywood Reporter
Eco Erek” continues economizing denim
UltraTouch LEED Certified Denim Insulation - 5.5 x 16 x 94
The Benefits of Recycled Denim Insulation
Blue Jeans Go Green Human Environmental Sciences
Blue Jeans Can Go Green! To Which All We Can Say Is, “Finally” - Fibre2Fashion
Innovations in Green Insulation Materials