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Those few square inches of dimples are not likely to make you into Lance Armstrong.
The micro-fins on Amy's helmet might have some effect on speed, or they might just be there as a psyche job, but I remember when they were experimenting with vortex generators on the helmets of open cockpit race car drivers, it was more to reduce the buffeting that happens at +200 MPH. In Amy's case, with the helmet being a large part of her CDa, it might be for speed or buffeting. If you are going that fast lying on your belly down an ice chute, you are going to want to be able to see clearly and not have your helmet shaking around in the wind.
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