They climbed via the switchbacks, then glissaded on the way down.
"No chutes for us #mtwhitney #99switchbacks #whitneyinthewinter"
Caption: We took the switchbacks up but the fastest way down is always the chute #glacading #whitneyinthewinter #mtwhitney #whosinfront
I should probably be pointed out that the picture here does NOT show good or recommended glissading method. This slope should never be done without ice axe, proper braking and knowledge of self arrest. People have died on this slope, and have lost control even with good technique. These folks just had the good fortune of perfect timing, to descend before any icy patches developed. It only takes one.