aeron Size:40 - Outsole: R3CC carbon composite

- Outsole: R3CC carbon composite – stiffness index 6 for smooth power transfer and all-day comfort

- Fit System: Firmor X internal wrap – stabilizes arch and enhances fit tension

Adjustable Calf System

on-the-move adjustment for personalized fit

- Protection: Integrated tibia foam panel – soft-impact coverage where it matters most

aeron Size:40 - Outsole: R3CC carbon compositeUpper: Ripstop fabric with rubber bumpers lightweight, tear resistant, and protective Closure: Dual NUUN 001C aluminum dials aerodynamic, precise, and secure fit control Instep: Adaptive instep linked to dials molds to foot for a personalized fit Fit System: Firmor X internal support + tool free heel adjuster enhanced foot stability and alignment Tongue: UNUM Ergo anatomical tongue relieves pressure for consistent comfort Outsole: X2FC full carbon