- This race-inspired design is known for its great fit and great value. With similar features to the S-Works Prevail—like the Tri-Fix webbing system and 4th Dimension Cooling—the Propero II handles even the most intense efforts on the pavement. - Helmet Sizing Chart (PDF) - 4th Dimension Cooling System with Mouthport - Headset SL fit system with 4-position height adjustability is secure and easy to adjust on the fly - Tri-Fix web splitter for improved comfort and ease of strap adjustments - Composite matrix internal reinforcement allows larger vents for greater cooling - Soft 4X DryLite webbing material won't stretch out with sweat or water
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