The BlackStrap The Tube is both technical and functional, as well as pleasant. Its airy and moisture-wicking fabric provides UPF 50+ UV protection and is anti-microbial-treated, so sweaty stench can go away. The term "four-way stretch " refers to the fact that no movement is restricted. In the BlackStrap The Tube, you can protect yourself from the elements. BlackStrap The Tube | Multi Black | Christy Sports