This wasn't by deliberate design at all, but all 5 of the watches that I wear (3 Omegas & 2 Seikos) seem stay put well above the ulnar head whenever my body is warm but slide below it whenever I'm cold (or whenever the ambient temperature is relatively hot/cold). When they stick above, it doesn't even seem possible that they'd ever slide enough to slip underneath it without loosening the bracelets; and when they slide underneath it, it doesn't seem possible that they'd ever stay put above it without tightening the bracelets; but they do. Luckily, I'm comfortable both ways, although slightly more so when they're underneath the ulnar head. If I were to adjust the bracelets in either direction, my watches would be very uncomfortable in one of those situations or the other.
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