The body is translucent white with yellow processes. The oral veil has eight or more yellow projections. The gills and rhinophores are translucent white, tipped with yellow
Some individuals have yellow spots or lines on the body. The animal may reach 4,5 cm in total length. It is distinguished from Polycera quadrilineata in having more than six processes on the oral veil and a more squat body shape.The spawn is a white coiled ribbon.
Polycera faeroensis feeds on erect, colonial bryozoans such as Bicellariella ciliata, Crisia denticulata, Cellepora pumicosa and Bugula plumosa.