I think there is an exact quote for this, but I've been able to find only these:
Their fear* were tenacious therefore of life 'in the raiment of Arda', and far excelled the spirits of Men in power over that 'raiment', even from the first days (28) protecting their bodies from many ills and assaults (such as disease), and healing them swiftly of injuries, so that they recovered from wounds that would have proved fatal to Men.
*Spirit more or less (my note)
Morgoth's Ring - Laws and Customs among the Eldar
With that he sprang forth nimbly, and then Frodo noticed as if for the first time, though he had
long known it, that the Elf had no boots, but wore only light shoes, as he always did, and his feet
made little imprint in the snow.
The Fellowship of the Ring, Chapter III The Ring goes South