My New Marmot Helium sleeping bag is hot and light. The problem is that it gets damp on the top of the bag, I think from condensation from escaping hot air over night. Is it worth treating with a DWR spray.
I'm no expert, but would have thought it would be much more preferable to let the water escape and lie on the outside of the bag, rather than be trapped inside it. I'd leave well alone.
Your outer shell is DWR treated so no need for spraying just wipe off the moisture with a towel and let your outer dry. Dampness in the down is not due to the moisture on your outer shell but due to perspiration. You're running too hot in your bag, try to use it as a blanket it might just do the trick. Or else stick a leg or arm outside as well, don't use your cap of the bag around your head or no cap on your head etc. all kind of tricks to make it cooler in a sleeping bag which is overdimensioned for the periode your camping in. Otherwise use a VBL.
Your outer shell is DWR treated so no need for spraying just wipe off the moisture with a towel and let your outer dry. Dampness in the down is not due to the moisture on your outer shell but due to perspiration. You're running too hot in your bag, try to use it as a blanket it might just do the trick. Or else stick a leg or arm outside as well, don't use your cap of the bag around your head or no cap on your head etc. all kind of tricks to make it cooler in a sleeping bag which is over dimensioned for the period your camping in. Otherwise use a VBL.
I know about the perspiration, in winter its worse due to the odd mild night. I will try the blanket option or should I try a bivvy bag? Sticking body parts out isn't advisable in sub zero temperatures.
I agree with Peter as long you do not prevent to make it possible that your damp of your body will be transported through the insulation of your bag. Zeroing all out involves using VBL's and DWR treated or water resistant outer fabrics. But mind you using a VBL isn't considered to be comfortable.
Sticking limbs out in mild sub zero temp isn't a real big problem as long as your body temp is perfectly oké . You will awake when your body temp is running lower so you can tuck in your limbs again. It works for me great.
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