Whoopie slings adjust by sliding the tail through the hand-spliced center section and are locked into position by stretching the center section out along the tail.

Samson Tenex Tec:

Tenex-TEC is a high-strength polyester rope with two ends per carrier to allow higher production splicing for standard slings. Excellent abrasian resistance and easy to splice, this construction also allows more rope surface conformance to objects being lifted than standard single braid constructions. It is Samthane coated to enhance its wear life. Spliced by the Experts at Rope Logic into your preferred  configuration.