The all-new Propero 4 helmet brings together the aero advantages of the S-Works Evade 3 with the ventilation of the S-Works Prevail 3, all while offering the comfort and confidence for which Specialized helmets are known. It has earned the highest 5-Star Virginia Tech® helmet rating. Every detail of the Propero 4 was created with Specialized’s equation for speed in mind: Aerodynamics + Ventilation + Lightweight = Fast.

AERODYNAMICS:
Developed with extensive CFD testing and validation in the Win Tunnel, aerodynamics were central to the creation of the Propero 4. Specialized integrated the aerodynamic leading edge from the S-Works Evade 3 directly into the Propero 4—resulting in a helmet that is four watts faster, or 15 seconds over 40 km, than the S-Works Prevail 3.

VENTILATION:
Drawing inspiration from the world-renowned S-Works Prevail 3, the goal was not just to replicate its performance but to elevate it. Ventilation became a focal point in the pursuit of a well-balanced, aerodynamic, and highly ventilated helmet. The Propero 4 adopts the rear-end design language of the S-Works Prevail 3 and introduces small 2 mm offset micro-channels that create turbulence throughout the airflow, helping generate a continuous, refreshing stream of air.

ATTENTION TO DETAIL:
Beyond aerodynamics and ventilation, the Propero 4 showcases meticulous attention to detail. Specialized incorporated advanced technologies found in its S-Works-level helmets, such as MIPS for added confidence and a fit system designed for all-day comfort. The Propero 4 does not simply meet expectations—it redefines them.

For helmets sold in the U.S. and Canada: Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for persons age 5 and older.

• The Mips Evolve Solution is a low-friction layer that allows 10 to 15 mm of sliding motion in all directions. Studies indicate that this reduces certain rotational forces transmitted to the brain during angled impacts.
• The Propero 4 earned the highest 5-Star Virginia Tech® Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University.
• The FS3 Fit System & Occipital Base Adjustment optimize comfort by personalizing the fit to individual head shapes, and the helmet angle can be adjusted for glasses compatibility.
• An adjustable Tri-Fix web splitter combined with thin 10 mm webbing increases comfort.
• Dedicated sunglass storage maintains a secure fit and keeps eyewear out of the way when needed.
• Micro-channeling and large rear vents increase ventilation.
• The S-Works Evade 3 front-end design enhances aerodynamics.
• A precision, full-wrap polycarbonate shell increases durability and delivers a premium finish.