An aero triathlon helmet is the simplest and most affordable speed upgrade you can make to the biking leg of your triathlon. Specifically on higher speed courses and long course triathlon.
Your head is a leading, large object that’s consistently bashing into the wind. Making your head more aerodynamic with an aero helmet will increase your top speed and reduce the effort you need to get there.
An additional benefit to most aero helmets is removing the need for sunglasses. An aero helmet that includes a visor means one less piece of equipment (your sunglasses) on the bike leg. Makes for a more simplified transition and can also improve your comfort. Different tints of visors are also available.