| What it is | Ultralight woven nylon shell fabric |
| Key trait | Downproof (contains down) |
| Also | Wind-resistant, water-repellent, soft |
| Used in | Insulated jackets, sleeping bags |
Pertex Quantum is a very lightweight, tightly woven nylon shell fabric known for being downproof (it keeps down fill from leaking), wind-resistant, water-repellent, and soft. It’s a staple face and lining fabric for down and synthetic insulated jackets and sleeping bags where minimizing weight while containing insulation is the priority.
Why it’s used
A core Pertex family fabric; its downproof weave keeps down inside a down jacket.
Frequently asked questions
What is Pertex Quantum?
Pertex Quantum is a very lightweight, densely woven nylon fabric used as the outer shell and lining of insulated garments and sleeping bags. Its tight weave makes it downproof — stopping down clusters from poking through — while staying soft, wind-resistant, and water-repellent at minimal weight.
What does 'downproof' mean?
Downproof means the fabric's weave is tight enough that down feathers and clusters can't migrate or leak through it. This matters for down jackets and sleeping bags, where a leaky shell loses insulation over time. Pertex Quantum's construction keeps the down where it belongs without needing a heavy fabric.
Where is Pertex Quantum used?
Mainly in down and synthetic insulated jackets, vests, and sleeping bags, as both the outer shell and inner lining, where its low weight and downproof, soft, wind- and water-resistant qualities are ideal. It's a favorite for keeping insulated pieces light and packable.
Sources
- Pertex Quantum — Pertex
- Insulated jacket fabrics — The Mountaineers