15 times stronger than steel. Light enough to float on water. The Dyneema® Down Jacket is the most technically advanced piece in the Catalyst line - we've taken our proprietary XERO™ recycled nylon fabric and integrated Dyneema into the weave to provide unmatched strength, then paired it with 750-fill Allied Feather Down insulation. It's the jacket you reach for when the conditions are serious and you don't want to think about your gear. Just the mountain. Relaxed fit to throw over anything.