3" is all you need. I never tried a 5" but can't imagine using/ needing it. We added this to the top of our RV king bed mattress. Awesome! Slept like a baby.
8 months ago
Age: Over 60
How often do you shop at JCPenney? Frequently
0out of 0found this answer helpful.
Was this helpful?helpful0unhelpful0http://answers.jcpenney.com/answers/submit/1573/product/pp5003791265/answer/2651578/undohelpfulness.djs?authsourcetype=__AUTHTYPE__&format=embeddedhtml&innerreturn=http%3A%2F%2Fanswers.jcpenney.com%2Fanswers%2F1573%2Fproduct%2Fpp5003791265%2Fquestions.djs%3Fexpandanswer%3D2651578%26expandquestion%3D2659887%26format%3Dembeddedhtml%26scrolltotop%3Dtrue&return=__RETURN__&sessionparams=__BVSESSIONPARAMS__&submissionparams=__BVSUBMISSIONPARAMETERS__&submissionurl=__BVSUBMISSIONURL__&user=__USERID__