We were replacing a 2 inch memory foam topper we have had for 10 years. It was a great topper, but it was time to replace it and we wanted a thinker topper this time as our chiropractor recommended. To our disappointment the total measurement of this topper is only 2 - 2 1/2 inches (not 3 1/2), even after 5 days of allowing it to "rise" to its original loft. The memory foam layer measures less than 2 inches and the fiber topper measures only 1/2 inch total. The comfort is good, but is is simply not what we are looking for.