So I finally got around to making an underquilt for my Ridgerunner - I had been using a klymit insulated pad. The cost/benefit of the Costco throw was too good to pass up.
My idea was to make a full length underquilt by using two quilts overstuffed using the seam ripping method. The insulated portion is 32 inches across by 77 inches long (both dimensions are when fully lofted). To help with the sewn through baffles, I used a layer of 2.5oz apex. I used the inside out method the make the quilt. I sewed in some grosgrain to the sides before turning inside out. Of course I used cat cuts on the sides; fits nice and snug.
The reason I call it "modular" is because I used the leftover portion of the 2nd quilt to make an addon 2/3 quilt that attaches to the original with Kam Snaps. I offset the baffles/seams with the original quilt to really boost the temp rating. Haven't tried it out yet in anything colder than 50, but I can tell you it feels really warm. To make sure I got the right amount of loft from both quilts, I got my father-in-law to get in the hammock while I used clips to "dry fit" before sewing.
When it was all done I used some Nikwax down proof and tumbled dry with no heat and some tennis balls. Haven't got a total weight yet, will update when I get it.
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