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Primaloft One - 1.8 per sq yard
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Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One - 1.8 per sq yard on 11/10/2006 19:59:14 MST Print View

Primaloft One - 1.8

I received a sample of PrimaLoft One in the 1.8 ounce per square yard weight (stated weight) My first reaction is "boy that stuff is thin". The clo for this product is 0.84. With the stated weight of 1.8 ounce I would have a clo of 1.51. The packing/compression size for the 1.8 ounce stuff has to be very small vs some of the other insulation I am working with. It looks nice but you can be the judge of that as you look over the pictures.

The first thing I make with the Primaloft One will be a Bivy Liner/Quilt. It will be the same size as the one I made out of Climashield Combat. I will run some tests and see if it is as warm as the Climashield Combat. The clo of the Climashield Combat in the Liner/Quilt I made was 1.59. This is just a small amount higher than the 1.51 clo of the PrimaLoft One.

Christopher Plesko
(Pivvay) - F

Locale: Rocky Mountains
primaloft one on 11/10/2006 20:29:43 MST Print View

Did they include recommendations for fixing/quilting it to the item? I got my wife a primaloft one jacket today and it's interesting compared to a micropuff (PG delta).

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One - 1.8 per sq yard on 11/10/2006 21:02:40 MST Print View

As you can see from the pictures the PrimaLoft One is sewn every 3". When I make my first Quilt/Liner I will sew it with the 3" sewn part of the insulation on the width and see how it holds up. I will not quilt the insulation as it will only be 36" wide.
I am sending this from a Sony Store using a wireless UX Computer.

Edited by bfornshell on 12/30/2006 18:16:06 MST.

Christopher Plesko
(Pivvay) - F

Locale: Rocky Mountains
Re: Primaloft One - 1.8 per sq yard on 11/10/2006 21:39:35 MST Print View

Is that all insulation itself there or is it trapped between batting or something on the top and bottom. If you did a double layer maybe you could offset it and quilt it so you didn't have the "sewn through" spot? Just curious as to construction methods used as down stuff is often baffled so you don't have loft reduction in the highest end gear whereas this seems to be sewn through right from the factory.

Very cool that you got some!

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One - 1.8 per sq yard on 11/10/2006 22:39:50 MST Print View

The insulation is sewn between a layer of what is called "scrim". It is called a "polypropylene carrier - scrim". You can see in the picture that is it more or less transparent. The scrim on the 1.8 ounce insulation has the feel of silk.

The PrimaLoft One comes in 1.8, 3.0, 4.0, 5.0 and 6.0 ounce per sq yard weights. You can also buy it in what they call "pre-quilted" for an extra $0.81 per liner meter. I have no idea what that means but will try and find out.

I agree with the idea for a double layer and the over-lap or off-set method. If I did a double layer I would get a clo of 3.02.

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Fabric Question for Richard on 11/19/2006 21:36:29 MST Print View


I am getting ready to made a Quilt / Liner out of the 1.8 oz PrimaLoft One. This one will be only for testing and will also use some of my light silk.

It will be made to use inside my Pertex Quantum / Cuben Bivy. In the other two quilts I have used light silk (0.57 oz per sq yard) for both the top and bottom layer of the Quilt. If I used Pertex Quantum instead of the silk would the Pertex Quantum add to the warmth of the Quilt? If yes, is the additional warmth enough to be worth using?

The difference in weight is 2.28 oz for the silk and 3.60 oz for the Pertex Quantum. The difference in cost is - I think Pertex Quantum would cost maybe 5 times more than the silk if you can get it.

I only want to use my Pertex Quantum where it will give me the biggest return.


Richard Nisley
(richard295) - M

Locale: San Francisco Bay Area
Re: Fabric Question for Richard on 11/19/2006 22:32:06 MST Print View

Bill-The silk is fine.

The insulation value is effectively the same for both fabrics. Besides that, there is negligible insulation contribution from either fabric. All they do is protect the insulation and block forced convection (wind). Either one adds up to about .35 clo of insulation by virtue of the fabric being something for the air boundary layers to adhere to. The moisture absorption on the silk will be about 5% and the nylon 4.5%.

Edited by richard295 on 11/20/2006 00:00:45 MST.

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Fabric Question on 11/19/2006 23:20:02 MST Print View

Thanks Richard,

I had been wondering about that for a long time.

Then I guess I could apply the same strategy to insulated body garments. As long as the outer most garment was made out of something more or less WPB when the weather required me to cover the silk item(s).

Using silk for the inter layers would let me make insulated garments for different temperature ranges without using as much of my Pertex Quantum on each item.

I may have so much Pertex Quantum left over that I can go into the SUL Bivy business.

Ben Strickland
(ben_strickland) - F

Locale: Georgia
Downproof? on 11/22/2006 10:07:56 MST Print View

One thing to note is that I believe Primaloft requires the use of downproof fabrics... I'm pretty sure that lightweight silk is not quite downproof.

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One and using Silk on 11/22/2006 12:14:53 MST Print View

Sorry Ben,
Your thought about my silk not being Down-proof is just wrong. I have been using two different weight silks (1.02 and 0.57 ounce per sq yard) for about 3 years. I use the best Down I can find and never less than 800 plus. A rare feather might get through my silk once in awhile but not enough to worry about. I get more feathers out of my WM Down Sleeping Bag than I do out of my Silk baffles.

I expect NO problem using the same weight silk for PrimaLoft One or Sport. PrimaLoft come both pre-quilted and with a throw away scrim. I have some of both. The pre-quilted is really easy to work with and needs little more than sewing the outer edges to my shell material. The other needs a little more work according to which I am using but does not fall apart when handled.

I also have a PrimaLoft Product called PrimaLoft Footwear. You might look it up and think about the many possible uses for that one. I have a 5 yard by 60 " wide piece of that one to work with.

Jan Rezac
(zkoumal) - MLife

Locale: Prague, CZ
Double-sided garment idea on 11/22/2006 13:08:20 MST Print View

I can imagine an garment with synthetic insulation, where one layer is made from less breathable fabric (pertex quantum) an d the other from something very breathable (silk was the inspiration, but very fine mesh could be used to make the effect stronger).
When the pertex is worn outside, it works just as an ordinary insulated garment. Turn it inside out to lower the insulation - air convection will cause the heat to leak easier.
Such a setup will also dry faster, and, finally, you may save some weight...

Aaron Sorensen
(awsorensen) - MLife

Locale: South of Forester Pass
Re: Primaloft One on its own on 11/25/2006 19:10:25 MST Print View

Hey Bill,
Could you post a few pics of the pre-quilted P1.
The P1 you have pictured is a sewn-thru construction and should be used as a double layer so the sewn-thru lines would be in the center of the other.

I am wondering if the P1 is strong enough to be self sustainable? For my unsupported record attempt of the JMT, I am looking for an insulation I can use as a layer in its self, without fabric on each side.
I would have a base layer, whatever I hike in, the insulation layer, then a WPB layer, (drop-stopper).

The insulation would only need to last for 5 days and could have a skeletal fabric structure to hold it to the correct form.
If this could work, the weight of the gear without the fabric would be a great relief off of the base weight that would be carried 75% of the time any way.
The bottoms and top would need to be at least .6" of loft or an equivalent clo. The bottoms would need to stand up to 35* temps with lite weight patagonia under and the drop-stopper on top. The top will be a short sleeve patagonia shirt and a railraiders l/s shirt on the bottom, the drop-stopper on top and a 40" x 35" 2.25" loft down blanket on top

I currently have a bottom made with .6" Primaloft Sport and .85oz Ripstop. It comes in at 10 ounces, but without the fabric would be around 7oz. I am looking to get it to around 6oz and should be able to since the fit is too loose.

Bill, do you know if the P1 would work, or could you recommend which insulation would?

Edited by awsorensen on 11/25/2006 19:18:33 MST.

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One on 11/25/2006 21:48:44 MST Print View


Q - 1. Could you post a few pics of the pre-quilted P1.

A - 1. The second and third pictures at the top of the thread are what PrimaLoft calls "Quilting is available from the factory for an additional $0.81/linear meter." The material that is used for the quilting is called "carrier scrim". It is a very thin Polypropylene material and is not very strong. I just did a tear test. Not good, it is not very strong. I don't think it would last anytime if not covered with something.


I understand your quest for something very light. I played/tested a lot of different material to see what was "just" strong enough to work and last awhile when I was getting ready to make my SUL Quilts. The lightest silk I have is 0.40 ounce per sq yard 3 mm Silk Gauze and it is very hard to work with. I didn't think it would work and went with 0.57 ounce per sq yard - 4.5mm Habotai, product number 21H, from Thai Silk.

What to make. I would use Climashield XP as it should be the easiest to work. I would then make three very simple items. One would be a pull-on Vest, the next would be a pull-on Jacket and the third would be a pair of very simple pants. I would use 4.5 mm Habotai Silk as the shell and liner for it all. Having two upper body insulation items give you great flexibility and added warmth if needed. It also should take you to your low temp goal but with two insulated items. If you are slick you might want to sew a hood on the vest.

Hoods are fun. I am putting hoods on everything. Like my old SW and LW Capilene shirts that open at the top.

PrimaLoft One needs to be stabilized every 6" or so and would fall apart if you used it without a liner and shell. Sport is a little stronger and I have some. It is really nice but also would fall apart if used without a liner and shell.

Aaron Sorensen
(awsorensen) - MLife

Locale: South of Forester Pass
Re: Primaloft One on 11/25/2006 22:36:47 MST Print View

Hey Bill,
Thanks for the insight on the Climashield XP. If it is any stronger than the Primaloft Sport it will work. I will more than likely just use the veil material on each side. It holds a stitch good enough and weighs next to nothing, (about .22 oz per yard), maybe even less.
I think I will make a double layer vest, maybe single on the back and a single layer separate arm system to attach to it. I already have a 1 oz bomber style beanie that works.

After I make these and a new torso blanket, I will post the full packing list for the record attempt with pics.
The current list is shown on my user picture with my dog.

My torrso blanket is just too small. The new torrso (scratch), half blanket will be made with Momentuim90 on top and .85 DWR on the bottom with 4 oz of 800 fill. I have a homemade 5.2 oz SpinnTex shelter I am going to use, so I can use the down blanket.

I don't want to risk taking any down clothing without a larger tarp or bivy. Loosing that warmth in 35* rain would not make me a happy camper.
The down blanket however will have a cut for the head to be made into a wearable layer in case of high wind/ chill.

Edited by awsorensen on 11/26/2006 16:31:35 MST.

al b
(ahbradley) - M
RipStop Wadding on 11/26/2006 13:40:19 MST Print View

Perhaps the need for a shell fabric could be avoided if the wadding had a ripstop pattern running thru it.

Rose M
(roses) - F
silk on 12/20/2006 18:40:05 MST Print View

Hi Bill,

What kind of silk do you use that is downproof? Is it the flat woven china silk- habotai? I've used a light charmeuse before for a down travel pillow and it leaked feathers terribly. I usually get my silk from


Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Silk on 12/20/2006 20:06:45 MST Print View

Hi Roselle,

The question of "downproof and silk" really depends on the quality of the Down you use. I have always used Down from Thru-Hiker and that is what is in my Silk Down baffles. His Down is 800+. I ordered a pound of Down from him this afternoon. I really have never had a problem with Down migration using his Down. I think that is what its called. My standard has always been how much Down gets out of my WM Down sleeping bag. I can say that I get more Down out of my WM bag than I have with Thru-Hiker Down in my Silk baffles. I tried another Down supplier and it was OK but not as good or as easy to work with as what I get from Thru-Hiker.

My Silk comes from Thai Silks. I know about I think I have been buying silk from Thai Silks for over 16 years. I do use their Habotai China Silk. It depends on how strong the item I am making needs to be for me to decide what weight Silk I use.

You have to understand when I say "my Down baffles" I am talking about long Silk tubes that I put the Down into. Those baffles/tubes were then used inside Poly Tubes to make Down Air Mattress. When I used the baffles/tubes in a sleeping bag type item the baffles were still put into a sleeve so I really had a double layer of material. For several years I keep one of my Silk tubes of Down hanging over the door into my computer room. Every time I thought about it I would grab the tube (78" long) and pop it much like you might a towel in a shower room. I never really got any Down out of the tube.

I am trying to make two more Synthetic Quilts and another Down Quilt before I leave for my hike in January. I believe I will use Pertex Quantum for both the liner and the shell for those quilts. I just finished a Down Quilt with 4 to 4.5 inches of loft and used Silk for all of it. The total weight of that Quilt with 12 ounces of Down is 17 ounces. It will go inside a Bivy so it will be protected from the weather. With the Pertex Quantum I don't have to be AS careful about the weather as I do with the Silk Quilts.

Rose M
(roses) - F
silk on 12/20/2006 20:55:03 MST Print View

Hi Bill,

Thanks for your thoughtful reply. The down I had used was from a pillow. I'll have to experiment with the 800 fill. I was thinking something like epic for the outside, silk for the inside. I go backpacking with my daughter who is too young to carry her own bag, and too big to fit in mine. I'm getting sick of carrying 2 sleeping bags. So I'm thinking just carrying one, opened up as a blanket, with just silk underneath and our pads? Like the cocoon coupler. Or maybe a second one underneath, of synthetic fill that can be detatched. It would be for summer/tropical camping. We have warmer gear that I can't scimp on, but can go lighter on hawaii. (I hope to get to hawaii in the next year)

rebecca milward
(incognito) - F
Re: Primaloft One - 1.8 per sq yard on 01/18/2007 21:07:37 MST Print View

hey bill,

i am a fashion student and i'm collaborating with a friend of mine who also happens to be a bit of a mad scientist. We are planning to make a self heating vest for my roommate who works as a conductor on the freight trains. She will be exposed to high winds and cold temperatures. I've been doing some research and have found Prima loft to be the most suitable. There will be nickel batteries built in to the vest with wire running through the entirity of it. I was wondering if you knew where to acquire the prima loft as i went to the manufacturer and they wanted a business profile. If you could let me know where exactly you got it from that would be wonderful


Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
Primaloft One - 1.8 per sq yard on 01/18/2007 22:35:28 MST Print View

Hi Rebecca,

There are two places that I know of where you can buy - by the yard - PrimaLoft insulation. It will be PrimaLoft Sport but it is just about as good as the PrimaLoft One. Sport also is just a little easier to work with. It will not be pre-quilted.

One place is
Quest Outfitters

The other is

I don't know anyone that is retailing PrimaLoft One at this time.