It's foam. So I'd say the answer is "No". they're not legitimate bass traps. Foam is almost useless for acoustic purposes. It might help a bit if you need to tame some highs (though 99% of the time, highs aren't the problem in a room. The bass is the problem) But, for bass absorption, you need rigid fibreglass. So, using the words "bass trap" and "foam" in the same sentence is an oxy, moron.