Therm-A-Rest Questar HD Sleeping Bag

The Therm-A-Rest Questar HD deals with that issue straight away with 610g (size L) of 650-fill Nikwax Hydrophobic down. So far I have used this bag inside a bivvy bag, on a damp multi-day wild camp in Snowdonia and on its own under a tarp in various forests, and not once have I noticed the familiar clumpiness that down bags with a traditional non-hydrophobic fill always get when exposed to moisture. Nikwax claim that this down absorbs 90% less water and dries three times faster than equivalent untreated down, and that it also maintains its warmth-trapping loft a lot more effectively; though it’s hard to quantify these claims in real world use, the general impression is that this hydrophobic stuff really works in challenging damp conditions. Care is also not much of a worry, with claims that it will survive five washes, and that it can be re-treated with Nikwax products.