Marmot Cold Technology

SpiraFil

SpiraFil is Marmot's own unique synthetic insulation used in our value-priced line of sleeping bags.

What is it?

SpiraFil is a unique blend of large, spiral hollow fibers for loft, and small polyester fibers for warmth, softness and compressability.

What are the benefits of this technology?

SpiraFil provides an exceptional combination of warmth, softness, low weight, and compactibility. Thermal bonding ensures high tear strength and long-term durability.