Ultra breathable quilt using mesh liner

I think the idea needs a fair bit of field testing. I can imagine that a zipped-up sleeping bag might not be very susceptible to the loss of warm air. A quilt might be a bit more susceptible. But MIGHT is the key word here: I don’t know.

Cheers

Field testing: And thrashers like me might lose a lot more heat than others.

— Rex

Out of curiosity:

59″ x 90″ = 4.1 sq yd

5osy Apex + 1 osy shell + 0.5osy liner = 6.5osy

4.1sy x 6.5osy = 26.65oz.

You weigh at 646g = 22.8oz, and that’s including the strap.  Is it tapered?  Is your scale off?  Are you lofting it w/ helium?? :)

Hi Rene

Thats a good question.

After reading your post, I double checked the dimensions. It’s 59″ x 89″.

During sewing the insulation stretched and I ended up using less then 90″ insulation. I don’t remember exactly how much. But calculation shows that it must be 59.5″ x 71.88″.

Another possibilty is that the scale is off. I will double check that.

Quilt is not tapered and I don’t have any helium. :)

Mmm – maybe little column A, little column B?  I imagine you’d remember if you ended up w/ 20″ excess fill.  I also question if it would stretch that much over 90″.

I guess the only thing that really matters is that you didn’t taper the design – the rest is error in one form or another.

Roger, your thoughts remind me of the analyses Richard Nisley has done of warmth and comfort in the classic pile/windshirt combo. I wonder if a warm, meaningfully adjustable quilt could be made using Huzefa’s idea of noseeum netting on both sides of the Apex batting, with a “windsheet” on it (attached on one side, kamsnaps on the other, so it can be used inside, outside, or neither) made of some lowish-CFM ultralight fabric. This would increase the weight of the quilt by about two ounces, I guess.

If you have sweaty feet, pull the sheet off that part, or, if you have a double and you want to offend your partner with some special wind, keep it pulled up. A 30cm grid of Velcro dots could be used to keep the sheet where you want it.

Hi Colin

I think you would have to make one and try it out.
You WOULD lose any ability of the outer layer to reject drops of water from the roof and other ‘spills’ of course.
Personally, I think I would prefer a more trad design.

Cheers

Would it be safe to use the Climashield Apex directly on the skin or with only a mesh between skin and the Climashiled Apex?

Is Climashield Apex made of plain (untreated) Polyester? And could breathing those fibers be a health issue?

I think you need a layer a fabric on both sides, sewn through all the way around the perimeter to stabilize the Apex

If you just had Apex against your skin, it would move around forming holes where there’s no insulation.

Hi Jerry,

I wasn’t aware of the danger that holes would form that easily. Thanks for pointing that out. I am not too concerned about this though. My idea was to put a layer of Climashield Apex (Apex) into a “sleeping bag inner sheet” / “sleeping bag liner” (liner). This MYOG liner is just two layers of uncal HyperD sewn together at the sides and at the foot end while the head end can be closed with omni tape (omni tape is skin friendly velcro). When I put the Apex into the liner and close the top with the omni tape, I get a quilt. When I go somewhere where it’s really hot and the quilt would just make me sweat at night, I take out the Apex and use the liner as a summer sleeping bag. I can also use the liner as bed sheets to sleep in hostels / hotels when I don’t trust their sheets.

I guess it is impossible to avoid that some of the fibers remain in the liner after taking out the Apex and I would expose my bare skin to the inside of the liner. This is why I asked whether it is safe to use Apex against the skin and whether those fibers could do any damage if you breath them in?