The specialized propero ii womens road bike helmet offers exceptional aerodynamics thanks to its race inspired design the helmet has a hairport sl fit system which gives you four height positions to choose from and a micro adjustable dial for the perfect fit the hairport sl system is also ponytail friendly giving you space to wear your hair in a ponytail so yoursquore not distracted by the ride ahead the helmet also has a tri fix web splitter for improved comfort and easy strap adjustments