I used my BA 15-degree mummy with an uninsulated air core mattress this last weekend, on the shores of Lake Superior in 55-60F overnights. It worked, but took a bit to get it dialed in. If I deflated the pad too much, I got a cold spot on my backside exactly where the pad bent to accommodate the lay of the hammock. If I inflated it too much, the pad was too rigid in the hammock. Fortunately I remembered to put the valve end right next to my head so I could play with the inflation until I got it where I liked it. Once I got it dialed in I slept like a baby. Or as Shug would say, like a wino.
As I just bought my hammock rig and am also running low on funds, I think my next step will be to buy a cheap fleece stadium blanket from a thrift store and use it to make a sleeve for a piece of reflectrix, then run that down the back of the sleeping bag in place of the inflatable pad. Hopefully I'll get the time to both make the pad and test it before the summer runs out.
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