Dyneema, Spectra, and Vectran lines are recommend for use in applications where low to zero stretch is the core requirement. It's common to see these lines used as halyards, in sail control line systems, as travelers, or even as replacements for wire rigging in some performance applications. Since most low stretch Dyneema, Spectra, and Vectran lines are a single-braid without a cover, they are not recommended for applications where the line needs to be cleated and uncleated often. In those use cases you'll want to consider a line with a cover, such as a high performance dyneema or spectra core line with a heavy duty polyester cover.