calf cramps - anyone ever use a calf sleeve?

[Andrew]

Hello,

Has anyone used a "turf sleeve" like the one pictured below to reduce
calf cramps? I get them at about mile 10 on the bike after the run
portion (of biathlons). Stretching, hydrating, potassium consumption,
and lowering the seat does help, but not entirely. Perhaps this calf
sleeve could keep the calves warm the muscle flexible, though I don't
know the physiology of a cramp. What do you think?

http://a763.g.akamai.net/7/763/1644/76/app.infopia.com/img/image/fp/VPID/2983229/extra/1

Thanks in advance!

Andrew