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I’ve got this as a cheap/cheerful option to add a bit of warmth to an inflatable mattress: https://www.decathlon.co.uk/p/foam-trekking-mattress-mt100-180-x-50-cm-1-person/_/R-p-13259?mc=5591048&c=GREY
Aim to limit convention as well as conduction with the ground, so put your best reflective layer on top of your inflatable mat, not underneath to stop heat escaping through the mat in the first place.
Second, especially if in a bivy bag. Make sure you leave enough space for your bag to loft. Insulation is there to trap the air, if it can’t loft then no insulation. Ditto with mats in bags, if needed move to the outside.
Then think clothing, you probably have enough already, but wearing so many layers that you end up squashing the bag from the inside and compressing it will still leave you feeling cold. If you have a down jacket better to unzip it and lay it over the top of the bag vs wearing it to trap more air without compromising bag loft
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C4r1s
@dangeek
I’m hoping to get away in the next week for a night or two but don’t own any winter specific gear. It’s around 0 degrees at night here.
I’m thinking about using two mats inside a bivvy, mainly to stop them sliding around. My warmest bag, which is only 2 season and a blanket.
Any other tips?