Silca Aero Socks - Tall | Black Road Cleats The defining feature is 4mm

The defining feature is 4mm thick butyl rubber in the tread area

and Teravail's strategic butyl thickness in the tread zone protects where punctures actually happen rather than adding uniform weight across the whole tube

rattle-free connection to frames with a braze-on front derailleur tab

and does the job quietly so you can stay focused on the effort

Silca Aero Socks - Tall | Black Road Cleats The defining feature is 4mmWhat makes the SILCA Aero Socks Tall faster on the bike? The SILCA Aero Socks Tall are built to be a genuinely great sock first, with real aerodynamic gain on top. SILCA worked with a renowned Italian sock maker and custom knitting machinery to combine a smooth frontal surface, where airflow stays laminar, with three rows of turbulators placed just ahead of the flow separation zone. Those turbulators energize the boundary layer and keep airflow