Its the heel cup "deeply" contoured shape that gets me, how it curves inward at the top where it is in contact with the foot, Elfin Shape refers to the "giant Achilles flair" spoiler like flared out part above that. I cued the video at 4m 32s, look at the way the highly contoured heel cup fits his foot -Hmm, no padding. I was just hoping elfin meant “too small” for you. the contour could be interesting though, if it matches me. Thanks.
...and the V11 which appears to be the same although I didn't try that latest version -