Under their nearly impenetrable coat of contour feathers lies a dense layer of soft, fluffy feathers called down, which may be up to two thirds of an inch [1.7 cm] thick and cover most of the duck’s body.
Zem kontūrspalvu klājuma, kas tikpat kā nelaiž cauri ūdeni, gandrīz visu to ķermeni blīvā slānī, kas var pārsniegt pusotra centimetra biezumu, sedz mīkstas, pūkainas spalvas, ko sauc par dūnām.