Jacks 'R' Better Greylock 3

2 reviews
5-star:   2
4-star:   0
3-star:   0
2-star:   0
1-star:   0


Weight 16 oz / 0.45 kg
Length 52 in / 1.32 m
Width 42 in / 1.07 m
Loft 2.5 in 6.4 cm
Material 1.1 oz., 30 denier, ripstop nylon
Insulation 800 or 900 fill power goose down
Temperature Rating 20°-25° F / -7° C



A high quality, 3/4-length, down UnderQuilt demonstrating…

Rating: rated 5 of 5 stars
Source: bought it used
Price Paid: $130


A high quality, 3/4-length, down UnderQuilt demonstrating exceptional craftsmanship. Exceeds similar products I have tested. The Greylock 3 supports my premise that America's cottage industry providers exceed most items that are mass-produced.


  • Very well made
  • Made in the USA
  • Weight (16 oz)
  • True to temperature rating


  • 3/4-length saves weight, but reduces coverage

Jacks 'R' Better (JRB) is a cottage industry manufacturer of hammocks and hammock products. Its reputation is well-known and, quite rightly, excellent. Having compared this product to the ENO Ember, JRB proves that many cottage industry companies provide better and lighter equipment.


I purchased my Greylock 3 used off of eBay. The seller did not care for a 3/4-length (i.e. torso-length) UnderQuilt and was selling this in order to upgrade to a full-length UQ. While I could not pass up the $130 price tag, I will agree I would prefer a full-length UQ. This one criticism of the Greylock 3 would be a con of any shorter UQ, and does not speak to the quality of the product itself. It does what it is designed to do.

I have owned this UQ since February 2013, and I have lost count of how many nights I have slept in it. I have used it in a wide range of temperatures. Tending to be a “cold sleeper,” I have only become uncomfortable at temperatures below 23°F, which is within the 20F-25°F comfort range established by the manufacturer.


A sub-freezing night in the Garden of the Gods Wilderness Area.

The Greylock 3 uses 1.1oz, 30 Denier, rip stop nylon with 800-fill down. For an additional fee, the UQ can be purchased overstuffed or with 800-fill Activ-dri down, which is suppose to deal better in damp conditions. I have not tested these options.

The UQ is baffled to keep the down in place. Construction and stitching is exceptional. It is surprising that something so light and seemingly delicate can provide so much warm (In way of warning JRB's website does remind users that lightweight materials do not withstand much abuse. They also state that with proper care their products can last for a lifetime.).


I have used the 42”x52” UQ with three different-sized hammocks. I have found it to work well with all of them, including my 132”x60” DangerBird. Because it is only a torso-length UQ, an additional pad or even a backpack is required for insulating the legs and feet.


Fitted to my 60" wide DangerBird.

The Greylock 3 is fitted to the hammock using an adjustable shock cord that clips to each end of the hammock with micro-biners (included and part of the established 16oz weight). The UQ slides along this cord through sewn channels in order to place it where it is needed.


The cord is twisted in this pic to show the JRB logo.

Adjustable draw cords are placed on each end to close the air gap and bring the insulation up against the hammock.



The UQ comes with its own compression sack. However, I prefer to simply stuff the UQ into the bottom of my pack.


Summation: At only 16oz, the Greylock 3 is lighter than many pads and provides full coverage around the shoulders and hips. While I would prefer a full-length UQ, I have been immensely satisfied with the Greylock 3. The quality and craftsmanship make this product well worth the purchase.

trouthunter MODERATOR

If I didn't already have 2 Underquilts for my hammock, the Jacks R Better quilt would be a strong contender.

9 months ago
Bill "L.Dog" Garlinghouse

I got their Mt Washington 3 underquilt when I bought my Hammock at Trail Days. My understanding is that it's the full-length version of yours. It was wonderful on cold nights. When it warmed up, I thought I could get away with just a partially inflated Thermorest pad under me. I gave that concept up after a miserable 58 degree night! Could not keep my shoulders warm. Damn thing kept shifting under me ... I went back to the UQ, and probably won't change!

6 months ago

Goose...this was my first UQ purchase and it worked really well. But like you and others, I prefer a full length UQ even though they're heavier. If you're carrying a sit pad it's usable , but if not, with a 3/4 length UQ, you still have to have something to keep your feet and legs insulated, so IMHO, it's a wash when it comes to weight difference between UQs.

2 months ago

As a lightweight bottom insulation this is great!

Rating: rated 5 of 5 stars
Source: bought it new
Price Paid: $180


As a lightweight bottom insulation this is great! I purchased it because it was the 3/4 length and it works well for the way I hammock sleep. It's a quality product made by guys you can speak to directly and who stand by their craftsmanship.


  • Lightweight
  • Very well made
  • Made in the USA
  • Fast shipping
  • Great customer service


  • A bit more expensive than mass produced products

I use this paired with an ENO DoubleNest hammock. For my height the length of the underquilt covers from neck/shoulders to below my knees. It is in my opinion very wide wrapping up nicely around me.

Setup is very simple and intuitive once attached to the hammock the full channel suspension is adjustable from inside the hammock. Once adjusted properly it can simply be unclipped and packed away and left ready and nearly fully adjusted for the next use.

Overall packability is good. Can nearly be compressed down to the size of a soft ball. 

So far I have used this on one short backpacking trip, one BSA campout and a few nights of testing in my backyard. I use a sleeping bag for top insulation and add a small sit pad to the footbox area to complete the setup and have had great results.

I am very satisfied with my purchase and would definitely recommend this to others that want to hammock camp.


What part of the country are you hanging in, Johnnie?

9 months ago
johnnie scales

North East Arkansas.

9 months ago

Hey, I'm in Illinois, and I've been thinking about hiking in the Missouri Ozarks in the future!

9 months ago
johnnie scales

I hear good things about the Ozarks up there. I recently did an overnight in the Irish Wilderness of Mark Twain National Forest in southeast Missouri and really enjoyed it

9 months ago

Jacks 'R' Better Greylock 3


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