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Swiftwick Four Sustain Socks

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Item # SWF000C

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Item # SWF000C

Sustainable comfort.

Swiftwick developed the new Four Sustain Socks to be its signature double cuff design. Some call it the 'one-quarter calf,' while Swiftwick simply calls it the Four -- as in four inches of cuff length. The 'Sustain' in the title refers to the recycled nylon used to construct them. So, if you're after medium-profile socks that were manufactured in the USA from post-industrial materials, Swiftwick's got you covered.

The socks were made from REPREVE, which is a post-industrial recycled nylon. In fact, as part of Swiftwick's line of socks that are created from this post-industrial recycled nylon, the Zeros were made to represent Swiftwick's carbon neutral philosophy and commitment to conserving and recycling. The socks were manufactured in Tennessee in Swiftwick's own factory, where its employees oversee every step of the process. Like the Olefin used in Swiftwick's synthetic collection, REPREVE wicks exceptionally well and is also hydrophobic, meaning that it will not absorb water. So, you'll stay dry and comfortable since the socks move with your feet and minimize (or eliminate) abrasion against your skin.

The Zero Sustain socks were created by a 200-needle machine process that yields a high density, seamless knit fabric. The cushioned footbed gives way to the thin-channeled upper -- both components playing a crucial role in providing overall comfort. The arch band provides support in the midfoot, and the Y-shaped heel contour assures that you won't experience any bunching or that overstretched feeling in the back.

Several knitting patterns in the footbed and cuff give the Sustain Socks a compressive nature that promotes blood flow in the feet. This then leads to improved vascular performance, resulting in reduced fatigue and a speedier recovery.

The Swiftwick Four Sustain Socks are available in four sizes from Small to X-Large and in the colors Black and White.

  • Recycled nylon
  • Four-inch cuff
  • Compressive

Tech Specs

post-industrial recycled nylon
4 in mid-calf
Recommended Use:
Manufacturer Warranty:

Size chart



Swiftwick Socks
US Men's 3-5.5 6-9.5 10-13 13.5-16
US Women's 5-7.5 8-10 10.5-14 14.5-16.5
Euro 35-38 39-42 43-46 47-49
How to Measure:
For best results, take measurements over your underwear.

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Here's what others have to say...


Air conditioning for your feet

  • Familiarity:I've put it through the wringer
  • Fit:True to size

I'm no rocket science to understand how these work, but they are truly amazing! They seem to draw the moisture up to the ankle, where there is a different material as if I just wear these around the house my feet get incredibly cold. By drawing the moisture up and evaporating it they stay incredibly cool. Need a sock that will stand up to those long hot rides? You found it!

Avg. ride time: 0m per week
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Well made and comfortable...

  • Familiarity:I've put it through the wringer
  • Fit:True to size

I use these bad boys for road and mountain cycling in the spring.summer/fall. They are the perfect height cuff for me...not tool tall, but taller than your standard, old school cycling sock. I go black, it lasts longer because you don't see dirt stains for mud spray or dust and grime when you are getting rad. At this point they are the only socks I'll buy to ride in, barring winter needs.


Just a little too big.

  • Familiarity:I returned this product before using it
  • Fit:Runs large

I'd LOVE these socks, if I could get them in a size that fit. I wear a women's 6.5 shoe size and the small size was just a tad too big. Also, this is more a comment on the product description but I purchased a pair expecting them to be all white. There's actually a swiftwick logo on the back that's not pictured in the description. Otherwise, Swiftwick makes some of the most comfortable socks and I also like that they're made in the USA.

Awesome socks.


Best socks of all time!

  • Familiarity:I've put it through the wringer

Best riding socks of all time! Breathable, comfy, soft, perfect fit and stylish! Cant get enough!


Earth-Friendly & the best fit in 1 sock

  • Familiarity:I've put it through the wringer
  • Fit:True to size

Not only do you get the benefit of have a Swiftwick sock, which is the best sock on the planet, you also get the added benefit of wearing a sock that helps keep our planet clean.