- 800 fill power synthetic down is warm even when wet
- Durable water-resistant (DWR) lightweight exterior shell
- Contoured fit to reduce bulk and maintain loft
- Durable YKK zippers throughout
- Zippered chest pockets for secure storage
- Warmth sealing stretch cuffs
Light and warm, an elusive jacket combination. That's exactly what the Nano Ultralight Jacket is though, superlight and pleasant even with frost glassing fall leaves. Synthetic down is the key. It's very light and warm even when wet.