innerspring mattress

20 LETTERS · STARTS WITH I

innerspring mattress is a valid 20-letter word worth 24 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1N1E1R1S1P3R1I1N1G2M3A1T1T1R1E1S1S1

1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does innerspring mattress mean?