I chose the full-length version just because that's the most typical TT choice.
According to Geoff who runs the tunnel, aero shoe cover results have not been super-consistent. Sometimes faster, sometimes slower.
Edit - it might be that the texture on those Castelli socks might just happen to be advantageous... who knows.
After 7 12 minute runs (I had to re-do at least one because I moved my position!) I was a pooped - I'm totally out of shape since I have not been on a bike for 8 weeks. I wanted to experiment with pedaling style, but I had already gone over my 2 hours of reserved tunnel time and it was getting harder for me to really be steady and keep a good position. But that is definitely something I want to do in the future.
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Ed O'Malley
www.VeloVetta.com Founder of VeloVetta Cycling Shoes
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