Emma Hindle, Grand Prix with Wie Weltmeyer and Prix st George with Diamond Hit ride barefoot.

The suppleness with which Hindle's horses moved in Saumur was remarkable. Both Diamond Hit and Wie Weltmeyer bounced off the ground striding with confidence. The secret to this power and rhythm in her horses is the fact that they wear no shoes.
"The experiences I've had riding without shoes is unbelievable," Hindle explained

http://www.eurodressage.com/reports/shows/2005/05saumur/hindle.html (met foto's)