Amfanin ƙasa da gashin tsuntsu a matsayin kayan cikawa:

1. Kyawawan rufin thermal: Ƙasa zai iya samar da iska tsakanin gashin fuka-fukai masu kyau, yana hana asarar zafi da kiyaye jiki dumi. Idan aka kwatanta da sauran kayan cikawa, ƙasa yana da mafi kyawun aikin rufewar thermal.2. Mai nauyi da dadi:Down yana da nauyi saboda ƙarancin ƙarancinsa, wanda baya baiwa mutane jin daɗi. A lokaci guda kuma, ƙasa yana da taushi da jin daɗi, yana iya daidaitawa da ɓangarorin jiki, yana ba da ƙwarewar bacci mafi kyau.3. Kyakkyawan karko: Down yana da ɗorewa mai kyau, mai iya jurewa amfani na dogon lokaci da tsaftacewa, kuma ba ya da sauƙi ko sawa.4. Kyakkyawan numfashi: Down yana da kyakkyawan numfashi, yana iya kiyaye bushewa da samun iska, yana hana haɓakar ƙwayoyin cuta da ƙwayoyin cuta, don haka kiyaye tsabta da lafiya.5. Muhalli da lafiya: Down abu ne na cikawa na halitta, wanda ba shi da abubuwa masu cutarwa, mara lahani ga mutane da muhalli, kuma ya cika buƙatun muhalli da lafiya.6. Tsawon rayuwa:Kayan da aka cika ƙasa yana da tsawon rayuwa, ana iya amfani dashi tsawon shekaru da yawa ba tare da rasa aikin sa na zafin jiki ba.7. Kyakkyawan matsi: Kayan kayan da aka cika ƙasa yana da kyakkyawan ƙarfi, yana iya ɗaukar ƙaramin sarari yayin ajiya da sufuri.8. Kyakkyawan elasticity: Kayan kayan cikawa na ƙasa yana da kyawawa mai kyau, yana iya dawo da sifarsa ta asali, ba ta da sauƙaƙawa, da kiyaye ƙwarewar amfani mai daɗi.

A taƙaice, ƙasa da gashin tsuntsu (duck down da Goose down) a matsayin kayan cikawa yana da fa'idodi na ingantaccen rufin thermal, nauyi mai sauƙi da jin daɗi, ƙarfin ƙarfi mai kyau, kyakkyawan numfashi, abokantaka da muhalli da lafiya, tsawon rayuwa, matsawa mai kyau, da haɓaka mai kyau. Saboda haka, ana amfani da shi sosai a cikin kayan kwanciya, tufafi, samfuran waje, da sauran fannoni.