Hammock Underquilts

Jacks R Better invented the hammock underquilt in 2004 — still the warmest, most reliable hammock insulation there is, with no crushed padding and no cold spots. Some hangers call it a bottom quilt or a hammock blanket; whatever you call it, it hangs below your hammock and traps a warm layer of air your body weight can never compress. Every one we make is a down hammock underquilt: 850FP RDS-certified down behind our wind-resistant 20 denier nylon shell, 1000FP down in 10 denier nylon on the Ultralight models, 40° to 0°, hand-sewn in Pennsylvania.

Not sure which one? Start with the Mt Washington 3. 20°F, full length, and it fits any hammock, bottom-entry Hennessy included. It covers most three-season hangs, and since you can't overheat in an underquilt, it handles warm nights too.

Hanging in winter? The Mt Washington 4 is our full-length 0°F cold-weather hammock underquilt, and the Winter Nest is the 0°F cut for a Hennessy. Counting ounces? The 3/4-length Greylock and the Ultralight Mt Washington 3 are our lightweight picks.

Every one of them ships with more down than its rating requires — the overfill other makers sell by the ounce, included as standard and never an upcharge. How much more depends on the baffle: 36% above base fill rate in our Dual Differential Contoured Radial models, 25% in the box-baffle Nests. Here is the arithmetic, and how to run the same comparison on anyone else's quilt.

Not sure which underquilt is right for you? Read our Best Hammock Underquilts guide, or match your coldest night with our Hammock Underquilt Temperature Guide. Hanging under a Hennessy? The Nest and Winter Nest are the underquilts cut for a Hennessy hammock.

New to hanging? Start with hammock camping for beginners. Setting one up? See How to Hang a Hammock Underquilt, watch the setup videos, check which underquilt fits your hammock, or compare an underquilt vs. a sleeping pad. Building a kit from scratch? Start with the hammock camping gear checklist.

Sleeping warm takes insulation above you as well as below — pair one of these with a down top quilt. Or, if you want one quilt that works as an underquilt, a top quilt, a ground quilt and a wearable wrap, see our Multi-Function Quilts.