Unique hammock insulation (underquilt) that really works.
A tested and perfected underquilt, unlocking a new level of hammock comfort.
People usually think that to stay warmer while sleeping in a hammock, you need a sleeping pad. However, a hammock underquilt provides far greater comfort, allowing you to move freely without getting cold. In fact, there’s no comparison – sleeping with an underquilt wins in every way.
„ThermaClew“ is possibly the only underquilt on the market with a special Clew Suspension technology, which tenses the underquilt evenly and ensures that no part of the body goes cold, even if you’re rolling in a hammock like Rikis in the bed after two days in the woods.
Exclusive Clew Suspension System.
My Clew Suspension System is a unique, one-of-a-kind setup designed specifically for this underquilt. Every component is handmade, ensuring that each underquilt is crafted with exceptional attention to detail. The system
If you are using a hammock other than a Need for Trees model, please indicate your hammock’s length in the order comments.
Quick and easy to hang.
Thanks to the Clew suspension system, the hammock underquilt is extremely easy to attach, and you can always be confident that it’s hung correctly.
With other types of suspension systems, there’s often a risk that the underquilt won’t be properly tensioned on the first try, which usually becomes apparent only once you lie down in the hammock.
With this underquilt, you can achieve perfect tension in just a few seconds every time.
Four additional hooks – the underquilt stays securely in place.
I’ve added four extra hooks to the Clew system. They help ensure the underquilt doesn’t slip during the night and always stays in place.
Easy care with Climashield® APEX insulation.
Climashield® APEX synthetic insulation is low-maintenance, machine washable, and can be dried normally without special detergents or dryer balls. Unlike down, APEX retains its thermal properties even when wet, so there’s no need to worry about clumping or loss of loft. After washing, simply dry it, and the underquilt is ready to use again. It’s a practical solution for anyone who values simplicity, durability, and comfort in the outdoors.
Durability.
Climashield® APEX insulation is exceptionally durable – it retains its loft and warmth even after many uses. The synthetic fibers resist compression, moisture, and mold, allowing the underquilt to maintain its original shape and performance over time. Even with heavy outdoor use or frequent washing, its effectiveness remains unchanged, so you can be confident that your underquilt will provide reliable warmth for many seasons.
Temperature Ratings.
Different manufacturers provide varying Climashield® APEX temperature ratings, so I personally tested all APEX types. Here are the results I observed:
-
Comfort temperature: I slept completely without feeling cold.
-
Lowest comfortable temperature: I slept comfortably, but needed an extra thermal layer or felt a brief chill.
| Thickness | Comfort temperature | Lowest comfort temperature |
|---|---|---|
| APEX 100 | 12 °C | 9 °C |
| APEX 133 | 7 °C | 5 °C |
| APEX 167 | 0 °C | -2 °C |
| APEX 200 | -3 °C | -5 °C |
Personally, I prefer to sleep fairly warmly and am not the type to sleep with windows fully open in winter, so these results reflect my own experience and perception.
Weight and Volume
| Apex sizing | Weight | Volume |
|---|---|---|
| APEX 100 | 550 g | 3 l |
| APEX 133 | 610 g | 3.56 l |
| APEX 167 | 670 g | 4.5 l |
| APEX 200 | 750 g | 5.6 l |
Underquilts can be layered. For example, you can use an APEX 100 and an APEX 200 underquilt at the same time.
It is also possible to make thicker underquilts: APEX 267, APEX 300, etc. Contact us at info@needfortrees.lt for more information.
For those looking to achieve maximum comfort, I would also recommend getting a need.for.trees top quilt (a sleeping bag alternative) for your hammock.
Esse Woods (verified owner) –
If this would have been invented a few hundred years ago, no one would ever had invented the regular bed.
This is what takes hammocking from a good idea to actually an amazing experience.
mario –
i bought the gheed single layer hammock, because i use it mostly in parks and siestas on hiking tours. i sleep in it only once in a while, so there was no need for the integrated mosquito-net of the gilis.
i really love the hammock! it’s lightweight and super small when packed, and the double-end-opening stuffsack is neat and handy. the 40d Ripstop is just right in terms of flexibility. the 3,50 m length is really comfortable for someone like me – 1,87 cm tall and coming from 3,00 m or smaller hammocks.
the thermaclew is lightweight, small when packed and seems to be perfectly warm so far. but i have to test it in colder seasons to really judge it. my only concern is, that the clew has a tendency to tangle up, when stuffed in the sack. i solved this issue by using small adjustable loops to bind the strings together – that seems to work for know.
other than the underquilts i tested before, you barely notice it, when laying in the hammock. It fits well under the hammock and doesn’t push you to the middle.
personally i prefer to know, that the working conditions are fair and non-exploitative and i like to support a small, european manufacture…
… especially when it’s so customer-friendly and offers such good quality!
Johannes –
I got the ThermaClew Summer last week and have only slept in it for a couple of nights. Build quality and materials are very good. Although it is designed for use with original NFT hammocks, I’m currently using it with a Simply Light Designs “Trail Lair”. As the hammock is equipped with clips/hooks for an underquilt, it is possible to just use the outermost shock cords of the UQ clew suspension in these clips. The UQ is kept in place perfectly, I have not experienced any cold spots so far. I plan on ordering a Gilis hammock as a more lightweight alternative to my Trail Lair as well as another tarp in the near future. After all, one can never have too many hammocks, and I’m very happy to have found an excellent source for handmade hammock equipment in Europe.
Leve (verified owner) –
It takes just 10 seconds to attach and always fits perfectly. Honestly, it doesn’t get any better than this
Sofia (verified owner) –
Really nice uq! It was light and felt fluffy to the touch. Easy to put up and fold together. The compression bag was amazing; made the quilt really small! I have only tried it in -5° celsius and needed an pad in the hammock to make it perfect but looking forward to try it in the “right” temperature for the qulits recommendation (winter). Good communication from the seller as well!
Felix (verified owner) –
I got the summer version and a modified winter version, and im super happy with them! My old underquilt had problems with it sliding to the side below me during the night, but these ones have added “hooks” that makes them sit in place perfectly. If you need an underquilt then you wont be disappointed with these! Them being very light weight is also great, and makes them a lot cheaper compared to similar underquilts from other sites. They are also very easy and quick to set up compared to my old underquilt.
10/10!