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Zipps' Vuka Alumina Clip Risers work with the Vuka Alumina Above-Bar Clips (sold separately) and let you raise your armrest height. They're made of sturdy, lightweight aluminum and come in 10mm, 25mm, and 50mm sizes.

Zipp’s Vuka Alumina Clip Extension Mounts/Armrests are made of light, strong, stiff 2014-series aluminum and have nylon armrests with wide, comfortable foam pads. They're perfect for mounting your favorite extensions (sold separately) and finding your optimal aero position. There's also a model that goes above and beneath your base bar.