Mammut Crag Indicator Express Sling
Where to Buy
Here's what other sites are saying:
The Crag Indicator sling from Mammut incorporates smart indicator technology, which reliably highlights any serious damage to the webbing: In the event of critical abrasion to the sling, the red core fiber shows through, indicating to the climber that it is imperative to replace the sling.
The Mammut Crag Indicator Express Sling features a red core fiber that, when exposed, will let you know when it's time to replace it.