Box One Prime 9 derailleur:

Chain and cassette compatibility: While it's designed to pair up with the rest of the Box Three Prime 9 drivetrain components

Polypro/Nylon blend great for riding in normal to hot temps

The valve is located under the top clamp

and a convenient stretch overflow pocket for your top layers

DHaRCO Men's Long Sleeve Tech Tee - XL - Space Grey PDP|Option Box One Prime 9 derailleur:Giving you the comfy feeling of cotton with the technical features of DriRelease fabric, the DHaRCO Men's Long Sleeve Tech Tee is perfect for both riding and casual wear in cooler conditions. The great thing about DriRelease is that the tech that keeps you cool, dry, and fresh is built into the fibres themselves rather than just applied to the surface. This means that the effectiveness of the material won't reduce over time as the treatment won't wash