The Mountain Partisan Sling was designed by a former Green Beret, and brings together his years of experience along with all the best features of slings he's used into one superior sling design. 
Mountain Partisan Sling Features
Two-Stage progressive tension
Quick adjust system 
Easy index thumb loop
Solid lock bi-directional adjustment
Redundant hardware
Abrasion resistant shoulder sheath
Kevlar Sling Loop Features 
Quick attach
No mounting hardware required
High temp rated (800-900 degrees Fahrenheit)
Reduced sound