Hammock Gear has awesome deals on top and underquilts in the Econ line of products that come in all temperature ranges. For reference, around $150 for a 20 F item. The fabric they use is Ion and is describe by Dutch as:
Ion is a newly developed lightweight nylon fabric made for quilts, clothing, etc. This fabric has an extremely soft feel and tight weave to it and makes it great for a fabric that touches against the skin.
Weight per sq yard 1.1 ounces
No affiliation to either company.
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