Profile Design Aero HC System. When you're drilling it down the Kona highway or wherever your local triathlons are held, you need to be able to get a drink without sacrificing any aero advantage or losing any speed. The Profile Design Aero HC System is designed for use with tri bars and aero extensions. It puts the water bottle right in front of you, so you can get a drink without having to reach down to the bottle holder.
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