素足 is read as すあし (suashi) and means bare feet.
すあし
suashi
あしすじょうげんり
foot feature convention
しろうと
respectable woman (i.e. not a prostitute, hostess, geisha)
もと
cause
すなお
straight (e.g. hair)
そざい
subject matter
すばやい
quick (understanding, judgement, etc.)
そしつ
nature
すがお
face with no make-up
すばらしい
wonderful
すてき
lovely
そぼく
simple
そりゅうし
elementary particle