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Stephenson’s Warmlite Vapor Barrier Socks

Vapor Barrier Sock Profile
Vapor Barrier Socks

I’ve been testing a pair of Warmlite Vapor Barrier Socks since November as a replacement for the Integral Designs Vapor Barrier Socks I used last year. While they are a huge improvement in terms of effectiveness, the sewing workmanship is substandard so I really can’t recommend the product to anyone. That’s a shame because these socks have reaffirmed my belief in the effectiveness of using vapor barrier liners as part of my mountaineering and winter boot system boot system. I just wish I didn’t have to resew the seams when they come apart.

Vapor Barrier Clothing

Vapor barrier clothing is an alternative layering system for winter clothing that is designed to stop you from sweating and wetting out your clothing layers. It’s best used in very cold temperatures (10 degrees fahrenheit or less) when you need to wear the same clothes or insulated socks for days at a time and can’t dry them at night.

This is very different from the layering principle which most winter hikers are taught, which is to wear several layers of clothing so that sweat moves from your baselayers to your outer layers where it can evaporate without chilling you.

In practice, you can mix and match the two techniques using vapor barrier glove liners under your mittens and vapor barrier socks in your boots, while using a layering approach for your legs, head, and torso. That’s what I do since my hands and feet sweat uncontrollably on winter hikes, while I can manage my level of leg and torso sweat pretty well by taking off layers when I’m hot and putting them back on when I’m cold.

Very Simple Pattern
Very Simple Pattern – Vapor Barrier Sock

Fuzzy Stuff Socks

Stephenson’s Warmlite vapor barrier socks are made out a material they call “fuzzy stuff”, a knitted nylon fabric that is coated with urethane on one side. The socks are made with two layers of fuzzy stuff sewn with the urethane coating facing in, so it doesn’t wear off too quickly.  The pattern is really simple and almost clownish, with the seams running on the outside of the sock to prevent rubbing – friction – and blisters.

5-Layer Insulation System
5-Layer Insulation System

A Winter Boot “System”

While you can wear vapor barrier socks directly against your skin, a lot of people prefer wearing them over thin sock liners for more comfort because your feet do sweat under them, although much less than you’d think. For example, when I wear mountaineering boots, I typically pull the vapor barrier sock over the sock liner and then put on a mid-weight wool sock for insulation. The next layer is an Intuition foam boot liner if I’m wearing my plastic mountaineering boots (rated to -30 F) or an unlined mountaineering boot in warmer weather.

When I sweat, all of the moisture is trapped underneath the vapor barrier sock, which keeps all of the layers above it completely dry. This makes a huge difference on multi-day winter hikes because it eliminates the need to sleep with your boot liners or wool socks in your sleeping bag to prevent them from freezing at night and to dry them out. Not only is this more comfortable, but it means that that there will be less moisture trapped in your sleeping bag’s insulation and less loft/insulation loss.

Vapor barrier liners also create a warm micro-climate around your skin, trapping your own body heat close to it so you feel warmer with less insulation. They also prevent smells from migrating into your clothes, which can be a boon if your body odor bothers you.

Blown out Seam - Bottom Center
Blown out Seam – Bottom Center

Product Quality Issues

At $8/pair Stephenson’s Warmlite Vapor Barrier Socks are not expensive. But I don’t think that excuses the product quality issues I’ve experienced using them.  It’s gotten to the point where I’ve stopped calling Stephenson’s to ask for replacement socks when the seams blow out because they were sewn too close to the edge of the fabric. It’s really too bad because these vapor barrier socks work when the seams are intact, they’re comfortable to wear, and easy to hand wash. It’s just a waste of my time to have to resew them every trip or two and I’d rather have a product that is more expensive, better sewn, and more durable.

Disclosure: Philip Werner (SectionHiker.com) purchased this product with his own funds. 


  1. Did a snow shoe trip to South Hancock a few weeks back, I used an RBH designs VB sock that worked masterfully.

    • I will probably try those next. How is the sewing? How thick are they and do you wear them with socks under or over?

      • The sewing looks neat and evenly spaced, and many of the seams are strategically placed over the foot. I would say that they’re 3-4 mm thick. I wear a Smart-wool boot sock that’s about 7mm thick inside of them and used a PAC-Boot outside of that.

  2. More good stuff Philip! I do have a pair of these now…to try….I read many that still swear by the ole bread bag but I like that these let the drying process to occur and not JUST keep you foot dry! Looking forward to a couple of weeks when we get to spend an entire week at our time share in North Conway….we lost our virginity to cross country skiing and are obsessed with it! We’ll mix that with some snow shoeing…..that’s my chance to try to vapor socks!! Thanks for another great post!!

  3. Thanks for the review. I had been hoping these socks would be a step up from plastic bags. I wore plastic bag VBLs for the first time on a late fall hike up Osceola during freeze/ thaw/ hail conditions when I was walking through water then snow. Worked great at first but when the bags tore obviously the VBL effect fails. If you’re relying on them in more serious conditions, a seam blow out is a real problem.
    I’m still considering the stephenson’s –if I completely resew/ reinforce the seam upon purchase, do you think that would work or did the fabric rip on you too?

    • I think resewing them yourself when they blow out or proactively would work. But for $8, you could also buy a few pairs and just rotate them when they fail. Stephenson’s just sends out a new sock each time and doesn’t require returns. Maybe they’d figure out that bad quality ends up costing more in the end.

  4. This winter I finally tried VBL socks. They work amazingly well at keeping my feet warm and insulating socks dry. As others have noted, normal plastic bags tear easy. I’ve found that “turkey bags” (Reynolds Oven Bags) wear like iron!

  5. I just heard back from Jane at Stephensons…..they have a good supply of variable sizes with immediate shipping of just ONE DOLLAR! Can’t beat that shipping! I picked up two more pair and will be trying Philips idea of proactive resew of the seam. Headed north for a week of trail cross country skiing and some snow shoeing so I’ll let yo know how the sewing works.

  6. Try the plastic bags the newspaper comes in. I started with those and see no reason to change. You do need a few pairs of liners socks for overnights.

  7. I’ve been using 2mm neoprene socks from Cabelas as VBLs this winter. They’ve worked well so far. They’re a tight fit so no blisters, and I layer a hiking sock over them.

  8. That’s a shame about the sewing quality.

    Over the years many folks have recommended Warmlite Tents to me, recently I was going to look in to purchasing one and was put off by some of stories I heard of sub standard sewing.

  9. I do a lot of sewing, and so I think I can offer some insight into the substandard sewing. The socks were created using an overlock serger. Serging creates a stretchable seam (this is why you see most knit fabrics serged), but it is not often the most strong of seams, especially when done with a non-industrial (home) serger. I recommend that the company, in addition to the serged seams, reinforces it with a regular zig-zag seam.

    With a serger, these socks can be “banged out” in less than 10 minutes a pair.

    I don’t do much winter hiking, but I’m sold on vapor barriers thanks to posts like this.

  10. For the price, I can run a seam like Philip articulated with no issue.

  11. I’ve written this elsewhere, but Stephenson’s claim that their VBL gloves are made exclusively out of the “fuzzy stuff” is a lie. The cuffs are made of… COTTON. That’s right; cotton.

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