Spider Silk MK5

LengthSewn Loop - End 1Sewn Loop - End 2: 50m / Naked / Naked (165')

Extreme Tech Highline Webbing

Burly biglines or stable longlines

Feather Soft ...
Supreme strength ...
Very low stretch ...
No Twist marker ...

Quick Specs:

Stretch2.95% @ 6 kN
MaterialVectran with Colored Polyester
Weight35 g/m (2.35 lbs/100 feet)
MBS40.0 kN (9,000 lbf)
WLL13.3 kN (3,000 lbf)



Best Tension

1.0 - 4.5kN


Say hello to our all new hardy high tech webbing - Spider Silk MK5. With this new iteration of Spider Silk, we are returning to the roots by bringing back Vectran fiber. Spider Silk MK5 is made of mostly Vectran material with a bit of polyester mixed in for color and aesthetic. This webbing is as hardy as it gets!

Sporting a low weight of 35 grams per meter and a burly 40 kN MBS, this stuff is built to be abused. You can grip it, you can weblock it, you can rig it pretty much however you want and this stuff will withstand the abuse.

It's wonderful weave pattern gives it high visibility, a very soft feel on the foot and hand, and absolute confidence in grip on your foot - barefoot or not. This stuff is a dream for longliners and for high traffic zones on big lines (the end sections). Being that you can use any hardware with this webbing, it's ideal as a last and first segment on a monster line, or a biggish line that you know will see countless whippers.

Made in the US

For your sewn loop selection, please see the sewn loop details listed below.

For custom configurations, main/backup combos, or large orders, please reach out to us for a custom quote.

Durability to the Max

World class durability and longevity

Spider Silk MK5 is made from an extremely durable material known as Vectran. Vectran is a Liquid Crystal Polymer (LCP) and is the only fiber of its kind. Vectran has amazing durability properties that make it fantastic for long highlines and lengthy permarigs.

Spider Silk MK5 abrasion resistance

Not only does Vectran offer superior cut resistance compared to other high tech fibers, but it resists bending, flexing, and fiber-on-fiber abrasion quite well. These features combined make Vectran webbing exceptionally durable.

Stacking on to these features, Vectran Yarn has a surface feel that is very high grip. This makes Spider Silk MK5 exceptional for highlines where grip is needed. This might be a longline in a park, the end segments of a big line, or any beginner-friendly big highline.

Low Stretch and No Creep

An ideal line for big lines

Another fantastic feature of Vectran fiber is that it has no creep what-so-ever. That means that once the initial bedding in occurs with your webbing (initial stretch resulting from the fibers aligning within the weave), your line will remain the same tension throughout the rig. This is great for keeping your extenders the right length and not having to worry about your webbing growing over time and with more and more usage.

Spider Silk MK5 creep characteristics

Vectran, in general, also has very low stretch. However, due to the thic, dual-layer weave of Spider Silk MK5, it does experience a bit of stretch on the initial few rigs as the fibers align and straighten within the weave. After a few sessions though, the stretch minimizes.

Spider Silk MK5 Stretch Curve

Compare the stretch of Spider Silk MK5 to our other webbings on our Webbing Stretch page

High Vis Design

Bright edges make this webbing pop!

Spider Silk MK5 blends Vectran and Polyester yarns together to make a beautiful and highly functional highline webbing. The body of the webbing is made from 100% Vectran yarns. The edges, the filling, and the marker line are all made from colored polyester yarns - orange on the edges and filling and blue on the marker yarn.

Spider Silk MK5 design

The bright edge band makes this webbing highly visible from afar, which is great for spotting the ends on big lines and for safety on more permanent rigs.

A New Kind of Sewn Loop

Now offering Naked loops!

We exclusively sew our sewn loops on Spider Silk MK5 with Dyneema sewing thread. This gives us the ability to shrink the sewing patch to just 50mm long, making the sewn loops VERY compact.

Spider Silk MK5 Sewn Loop

Not only that, but we now have the option to do Naked sewn loops, which is a sewn loop without a protective sleeve (pictured above). Since this webbing will live in the middle section of highlines (more on this down below), the sewn loops will likely always be used at a segment connection. These spots in a big-line are prime suspects for unwanted oscillations. That's mainly due to the regular frequency of weight hotspots.

Most sewn loops on slackline webbings have a big bulky protective sleeve, typically made from nylon tubular webbing, which is quite heavy. Both the mainline and the backup line have these sleeves. Plus, when using soft connectors to connect your segments together, there will also be a soft thimble inside of these bulky sewn loops. Then you have your connectors, which are typically soft shackles or quicklinks. That's a TON of weight all in one little spot.

This is why we have opted to offer a naked sewn loop option. This brings the weight of your connection down by a staggering 50+ grams (assuming naked loops on main and backup). It also allows us to shrink the size of the sewn loop. We are able to fold over just 175mm of material, giving roughly a 125mm opening in the loop, which is plenty to assemble a segment connection.

Silk 99 segment connection

Please note, we are continuously working on our sewn loop designs. The sewn loop you receive with your webbing may look different than the one in the picture above. Whatever sewn loop you receive is our current best/strongest design.

Bigline Composition

Connecting segments in a proper order

Although Spider Silk MK5 is quite lightweight at 35 grams per meter, it's definitely not super light like our Silk 99. We built Spider Silk MK5 with the intention that it would have a number of uses. One of these uses is a part of a big highline compostion.

Silk 99 bigline composition

What that means is that typically a big highline operates and goes up better if you minimize the weight of the line. However, most ultralight webbings are not super durable and typically don't do well when mixed with hardware, like webbing anchors and webbing grips. So, to remedy that, we have begun to suggest that folks use a low-tech webbing at the ends of the line in order to have more durability at the locations where rigging is the heaviest (gripping, handling, locking, etc...).

However, now we have Spider Silk MK5, which is 100% compatible with all slackline hardware. You can grip it, you can lock it, you can handle it just like any low tech webbing. It really is the ideal webbing for those end segments on big lines.

So, when purchasing high-tech webbing for your bigline projects, we recommend at least 2 segments of Spider Silk MK5 to use on each end. It's a good idea to have one that is 50-60m long for the static side and one that is 100m long for the tensioning side. If you plan to tension on both sides, go with 2x 100m segments of Spider Silk MK5.

Tech Specs


Spider Silk MK5 Dimensions

Width – 20.0 mm (0.79 inches)

Thickness – 2.78 mm (0.11 inches)

Weight – 35 g/m (2.35 lbs/100 feet)


MBS – 40.0 kN (9,000 lbf)

WLL – 13.3 kN (3,000 lbf)

Webbing Anchors

AWL4 Mean Strength – 39.5 kN (8,880 lbf)

AWL4 MBS – 38.0 kN (8,542 lbf)

AWL5 Mean Strength – 37.5 kN (8,430 lbf)

AWL5 MBS – 36.0 kN (8,093 lbf)

AWL6 Mean Strength – 40.6 kN (9,127 lbf)

AWL6 MBS – 39.0 kN (8,767 lbf)

MightyLock Mean Strength – 38.6 kN (8,677 lbf)

MightyLock MBS – 35.0 kN (7,868 lbf)

Webbing Grips

LineGrip Slippage – No slippage up to 150% of WLL (22 kN)

Wafer XL Slippage – No slippage up to 150% of WLL 15 kN)

Wafer Slippage – No slippage up to 150% of WLL (6 kN)

Sewn Loop

MBS – 38.0 kN (8,632 lbf)

Thread Type – 210 Tex Dyneema Stitching


Raw Materials – Vectran with Colored Polyester

Weave Structure – Dual Layer Weave

Weave Zoning – Dual Strength Zones


Style – Optimizing for bomb-proof big lines

Optimum Tensions – 1.0 - 4.5 kN (225 - 1,000 lbf)

Preferred Lengths – 200+ m (660+ feet)


Approved – Yes

Backup Length – How long should the backup be with a Spider Silk MK5 mainline?

  • 50m main - 53m backup
  • 60m main - 63.6m backup
  • 100m main - 106m backup
  • 120m main - 127.2m backup
  • Other lengths - Backup 6% longer than main


1 kN – 0.37%

2 kN – 1.33%

3 kN – 1.83%

4 kN – 2.25%

5 kN – 2.64%

6 kN – 2.95%

7 kN – 3.24%

8 kN – 3.44%

9 kN – 3.63%

10 kN – 3.79%

11 kN – 4.06%

12 kN – 4.18%

Spider Silk MK5 stretch
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