I posted a thread a while ago entitled 'Mysterious Cramping Calf Syndrome' after being plagued with claf problems where they would just 'lock up' at varying distances into an event.
To cut a very very long story short(ish), my coah kept pestering me to try those long socks worn by Paula Radcliffe, Jo Pavey, Tim Benjamin et al....
When my calfs were particularly prone to going, (about a minute into any run), I ventured into the gym at work and made sure I was alone. Pulled my socks up and wound the treadmill up, just so I could say I had tried them and eliminated them.
Unbelievably, ran for 20 minutes and was running at 16kph come the end without a single spasm, tweak or minor panic.
All I can say is, the proofs in the pudding. (Whatever that actually means)!
And... the only people that have ever commented on my new look, are fellow track athletes who are also wearing the socks and have noticed a difference.
No, I'm not on commission!
Hope that helps.