Here, I found this:
"
SLINGSMontana Slings. This brand isn't new to the market, but a new "biothane" sling -- made from tough polyester that's wrapped in soft synthetic material -- will soon debut alongside the leather versions that have won accolades in recent years.
Unique to the Montana Sling is its Triple Wrap Knot that allows for fast and easy adjustment. Compatible with rifles using swivel studs, the slings sport quality detachable Talon swivels and come in 1-inch and 1�-inch widths. The Cobra model has a wider, padded shoulder piece.
The biothane sling works particularly well in cold, wet weather, according to Norm Comfort of IST Designs, which sells Montana Slings.
Its length allows you to sling your weapon over the shoulder or cross-body, while the knot slides far enough to tighten for easier storage or transport. It sells for $39 ($59 for the Cobra model) and has a lifetime guarantee.
See
www.istdesigns.com, or call (888) 478-6565."
http://www.armytimes.com/offduty/technology/ONLINE.GEAR.DUALUSE/Go to page 8 of this PDF:
http://deerhuntersofidaho.com/DHIweb/template/Fall2005.pdf