Nano Shell
![Nano Shell](http://seatosummit.eu/cdn/shop/articles/Technical_Blog_Icons-57_67e12578-efab-4f19-900b-9ce2246466c4.png?v=1653006135&width=1200)
Nano Shell is a 20 Denier Nylon fabric with a water-shedding DWR finish on the exterior and a microporous PU coating on the interior. This highly breathable, highly water-resistant, windproof shell fabric is used on the Sea to Summit Alpine sleeping bags and Cinder quilts where it protects the down from external moisture even during very wet conditions.