5.11 RIDGELINE TROUSERS5. 11 Ridgeline Trousers Tactical combines a casual look and feel with tough and ruggedised high performance utility. Built from 5. 11's proprietary ripstop Flex Tac fabric with mechanical stretch, the Ridgeline features bartacking at major stress points, durable buttons, and double needle stitching at all major seams. The Ridgeline Trouser will perform in the most demanding environments whilst providing supreme comfort or mobility.