I wonder how many people are gonna misspell the word ''mattresses''. Also, companies in the resale and distribution of mattresses are almost never sell only ''foam'', but also other types. And production companies will be much more concerned about their brand, rather than exact match. Maybe they will pay you some small xxx for the redirect, but I wouldn't hold my breath, because on top of all that it's .net, not .com.
Little value, overall, sorry. But good luck!