Pro-Edge: Premium edge for longest life. Superior performance is built-in. Pro-Edge is different from most other premium edge slings in that the edge protection is structural - it is built into the sling. Pro-Edge features edge reinforcement with twisted tire - cord yarns - for the same reason that these yarns are used in tires - they provide maximum resistance to wear (cutting and abrasion). Additionally, the twisting of these yarns provides an enhanced degree of resistance to cutting and abrasion as compared to non-twisted yarns. Longer life means reduced cost per use. Most other premium edge products are made with non-twisted yarns and with vinyl or polymer edge coatings - coatings that can wear off over time and leave the end-user with a simple "standard" edge sling.