I took my Zpacks 30-degree quilt down to 17 degrees (with additional clothing of course) last year on a Skurka High Sierra adventure trip. I really have no idea what you are talking about regarding “widespread reputation” for cold under-insulated quilts. That is simply false because their quilts are in fact known to be accurately rated or even slightly underrated temperature wise.
The Jacks ‘R’ Better Sierra Sniveller is a 25-30 degree (24 oz) quilt can be used for sleeping in a hammock or on the ground and includes perimeter tabs for a ground attachment system. It’s unique because it can also be worn as an insulated garment, with a non-snagging, mixed hook & loop re-sealable head hole in the chest. The hole seals tightly when not used so there’s no heat loss through it. You can also choose between a drawstring or sewn in foot box. The Sniveller is available in two lengths and filled with 800 fill power goose down, either treated or untreated. Price Range: $270.00-$280.00
We rebuilt the traditional log-cabin-style quilt with concentric, small-scale geometrics in bold, bright colors that pop against a textured white ground. * 100% cotton: white fabric is slubbed cotton; printed fabric is cotton; fill is cotton batting * Multicolor print matches easily with a range of bedding options * Machine-quilted for precision * Medium-weight fill * Pieced-front quilt and sham * ...
AVAILABILITY: Many of the quilt makers who specialize in highly customized quilts often have very long backorder times (2 months or more)  during periods of high demand. If you need a quilt and can’t wait, you’re probably better off buying a less customized, off-the-shelf model. This one factor, more than any other, can often determine which quilt you select.

Since polyester batting became available sixty years ago it has been the batting material most always used in Amish quilts. Being much easier to quilt than raw cotton batting found in antique quilts and by making a quilt much easier to launder (wet cotton batting weighs 'a ton!') practical Amish women quickly made the switch. Excellent but more expensive woolen batting is also occasionally used in Amish quilts.


INSULATION: High quality goose and duck down with fill powers of 800, 850, 900, and 950 provide excellent insulation by weight and are widely preferred by backpackers because they’re so lightweight. In addition to excellent compressibility, quilts insulated with down will last for decades of use if properly cared for. Some manufacturers only offer down that’s been treated with a water-repellent coating, while others prefer to offer it unadulterated. Down is naturally water-resistant so the jury is still out on whether “treated” down lasts as long and insulates as well in the real world vs. a testing lab. Regardless, with a little care and common sense you can keep a down quilt dry by carrying it in a waterproof stuff stack, picking good campsites that don’t flood in rain, and airing it out occasionally in the sun.
The Warbonnet Mamba is primarily designed for hammock use, but is available in a wider XL width (55″) which is more suitable for sleeping on the ground. It has a mummy-style footbox, is available in multiple lengths, and three temperature ratings, including 40, 20, and 0 degrees.  The Mamba is made with a black, 20d DWR ripstop shell fabric and overstuffed with 850 Fill Power Hyper-Dry Goose down. A regular sized 40-degree Mamba weighs 13.81 oz, while a wide weighs 16.3 oz. Price Range: $245.00-$330.00
The Sea to Summit Ember EB III quilt is very light (it weighs merely 757 grams) and thus perfect for those who prefer lightweight hiking. Despite its low weight, it offers great insulation – it has the lower limit rating of -10°C by the EN standard. The shell and lining are made of 15-denier nylon which provides great durability for the weight. The quilt uses 750-fill power Ultra Dry Down which is treated with DWR (Durable Water Repellant) so that it resists moisture. Sea to Summit claims that Ultra Dry Down absorbs 30% less moisture than untreated down and is up to 60% better at retaining loft when wet. The Sea to Summit Ember EB III quilt also features a footbox with a drawcord and an adjustable strap system for easy attachment to the sleeping pad. Press studs down the side of the quilt allow you to close the lower half for better insulation. The Sea to Summit Ember EB III quilt is due to its low weight and superb insulation a great option for hikers, mountaineers and other outdoor enthusiasts who need reliable sleeping equipment for 3-season hiking.

I took my Zpacks 30-degree quilt down to 17 degrees (with additional clothing of course) last year on a Skurka High Sierra adventure trip. I really have no idea what you are talking about regarding “widespread reputation” for cold under-insulated quilts. That is simply false because their quilts are in fact known to be accurately rated or even slightly underrated temperature wise.
WEIGHT: While gear weight is important, be careful not to sacrifice your comfort by selecting a quilt that won’t keep you warm in the conditions you need it to. In fact, insulation is usually the lightest weight component of a quilt, where the bulk of its weight comes primarily from the fabric used to make it. When choosing fabrics, consider their breathability and whether they have a DWR coating, which can be important if the foot of your quilt gets wet regularly  If you plan on using your quilt heavily, consider getting a heavier inner shell fabric as this is where the greatest wear and tear occurs over the long-term.
SIZING: When sizing a quilt, it’s important to understand whether the length includes the foot-box or not, since several inches of fabric are lost when forming a foot box. Quilt makers often provide recommended heights for users when quoting sizes, so look for these. Hammock users can usually get by with narrower quilts than ground sleepers, because they use underquilts which wrap around their sides and insulate them. Ground sleepers need the extra fabric and insulation to tuck under their sides to prevent drafts.
SIZING: When sizing a quilt, it’s important to understand whether the length includes the foot-box or not, since several inches of fabric are lost when forming a foot box. Quilt makers often provide recommended heights for users when quoting sizes, so look for these. Hammock users can usually get by with narrower quilts than ground sleepers, because they use underquilts which wrap around their sides and insulate them. Ground sleepers need the extra fabric and insulation to tuck under their sides to prevent drafts.
HABLE CONSTRUCTION® FOR GARNET HILL Quilted by hand, this charming bedding is pieced using small-scale prints to form its kite-like diamonds. The multi-print "kites" float on a soft-white ground to give this bedding its whimsical sense of movement. * Cotton, including the flannel fill * The artful "kite" pattern is made up of 3" pieced diamonds * Backed with allover star print * Star-print bin...
Our dream bedding has become a little dreamier — now offered in a modern printed stripe. All the same features our customers love about the solid-color Dream Quilt: all cotton, hand-stitched detailing, soft texture... * Quilted by hand for a delightful rippled texture * 100% cotton, right down to the billowy midweight fill * An ideal weight for all-season comfort * Sham has a simple envelope ...
EILEEN FISHER HOME EXCLUSIVELY BY GARNET HILL Rippled like the surface of a mountain stream, this intricate organic cotton coverlet is woven with jacquard stripes and then washed to create its undulating look and soft texture. A beautiful, heirloom-quality piece. * A versatile, substantial layer that offers year-round comfort * Made from soft, certified organic cotton * Woven with jacquard stripes ...

More and more backpackers are switching from sleeping bags to backpacking quilts because they’re lighter weight, more compressible, and more comfortable, especially for side sleepers. While top quilts have always been popular with the hammock crowd because they’re easier to use in the confined space of a hammock, they’re also a great sleeping system option for ground sleepers, when coupled with a sleeping pad. Backpacking quilts are ideal for summer and warm weather since they’re so easy to vent if you’re too hot. But in freezing temperatures, starting at 30 degrees and below, most backpackers still prefer a sleeping bag because the wraparound fabric is less drafty.
We rebuilt the traditional log-cabin-style quilt with concentric, small-scale geometrics in bold, bright colors that pop against a textured white ground. * 100% cotton: white fabric is slubbed cotton; printed fabric is cotton; fill is cotton batting * Multicolor print matches easily with a range of bedding options * Machine-quilted for precision * Medium-weight fill * Pieced-front quilt and sham * ...
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