Osprey For crag climbing there isn‘t a better rope. The particularly tight Sports Braid sheath construction in combination with slightly thicker yarns has given the Osprey an incredibly tough and durable sheath. This is why even after many falls the Osprey looks almost as good as new. The special double braid Sports Braid construction and Thermo Shield treatment help the Osprey pass the early UIAA sharp edge test 108.