The clue "What a mattress may be made of" last appeared in the Newsday.com crossword on October 17, 2020. The correct answer for this puzzle is "FOAM", a 4-letter word.
Solution FOAM is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is FOAM with 4 letters, and the shortest is FOAM with 4 letters.
No, "WHAT A MATTRESS MAY BE MADE OF" hasn´t seen a spike right now. Solvers are most interested in: determinism, appraisal, Determination, relating to the body and Perform together.
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The solution is 4 letters long.