This race inspired design is known for its incredible fit and tremendous value it has many similar features to the s works prevail like the tri fix webbing system and 4th dimension cooling granting the propero 3 incredible performance at a tremendous valueeasy adjust headset fsl ii fit system with four height positions and micro adjustable dial4th dimension cooling system with mega mouthport for enhanced comfortcomposite matrix internal reinforcement allows larger vents for greater coolings