Both the Expedition and Classic Rollercam® straps utilize a proprietary blend of UV Stabilized High Tenacity Polypropylene Webbing. Polypropylene is extremely hydrophilic and does not absorb water. Unlike Polyester or Nylon, Polypropylene is very tactical to the touch and will not exhibit a slippery texture when wet. The weave is tighter than normal, creating a unique texture and feel. Only the Expedition and Classic Rollercam Straps have the length woven into the strap.