Due to recent, intensified double checks of the resistance (MBS) of our tubular nylon webbing NOVA, we discovered some inconsistencies in our test results compared to those indicated by the manufacturer. This discovery helped us identify some necessary adjustments within our internal quality control process but led us also to the conclusion that we want to offer even more tests transparency to all our users and clients. It may help to implement more adapted precautions of each user, depending on each webbing's sensitivity in combination with its situation of use (weblock or sewn loop).

Following the completion of several, different tests on all our other Slack Inov’ webbings, please find the conclusion produced by our engineer, developer and quality control manager Florent Berthet below:

All tests have been done using the so called 3 Sigma* method, which measures 3 results from 3 exact same testing methods in order to indicate 1 single MBS outcome.





  1. “I used the “3sigma method” for a final MBS value, which is going to be used and indicated on each webbings product page in our online shop. This calculation method is really strict and lead finally to a MBS (Minimum Breaking Strength) value way under the lowest measured value (find the explanation of this sigma method on our blog as well:"
  2. “Even using the 3sigma method, our "real life MBS" are always above 25.2kN (except Nova: 20.7 on weblock, 24.2 on sewn loop) and this is reassuring and an acceptable safety margin for the use of highline with all our webbings.”
  3. “On most of our webbings (except Joker), the “Sewn Loops’ MBS” results are higher than the measured MBS in the weblocks. In some cases, the sewn loop seems to show even higher resistance than the measured values by our manufacturers (who use a real big weblock with larger diameter).”
  4. “Regarding our NOVA webbing, even on sewn loops, on our first produced batch (the only one ever sold), a sigma MBS falls finally still below the 27kN stated and measured by the manufacturer… For more info and our consequences taken after the analysis of NOVA’s test results, please find a detailed report in our blog:



For more safety and more continuous transparency to our clients and users, we decided to adapt to a more precised resistance info on each webbings’ product page. All different types of test results are considered very important to us, so they should be shared to our clients as well. With great care we will continuously test all our webbings and each batch, using this recent procedure we have implemented starting with the NOVA line. Therefore, our clients will find from now on all different types of MBS values, depending on each testing procedure, reflecting the different types of 'real life' situations:

  1. MBS value measured by the manufacturer
  2. 3 Sigma MBS value in a standard weblock (30mm)
  3. 3 Sigma MBS in our sewn loop
  4. MBS after 6 months of exposure to direct sunlight (this update may take a little while longer)

This whole testing process of our webbings has also reminded us that correct care-taking of your webbing is crucial and should not be of secondary importance to any highliner. Our developer recommends to all, more or less regular slackliners, the following habitutes, in order to keep your webbing in it’s best condition possible:

  1. Check regularly your entire line for visible damages.
  2. Store your webbing in a dry and sun protected place.
  3. If it got wet, don’t dry it exposed to direct sunlight!
  4. If you discover particles like sand, dirt, dust or lots of mudd inside your webbings’ fibers, wash in a machine without soap or additives, using your “delicate wash” option and only cold water.

If anyone is left with questions, or in need of some help to understand this report or the results correctly, please don’t hesitate to reach out to us via [email protected] and we will try to help and respond as fast as we can.

Thank you all for your trust and stay safe everyone!

Your Slack Inov’ Team