A 2015 My Green Mattress post described a redesigned Pure Echo with organic cotton, Joma wool, natural latex, and 760 individually wrapped coils.
A later official FAQ described Pure Echo as a latex-free, medium-firm innerspring upholstered with organic cotton and wool. A 2016 update also said a coil-and-ticking change had made the bed firmer before the quilting was revised for a softer surface.
Those records describe different generations. A used-mattress listing or old review should be checked against the law tag, manufacture date, and material label rather than assumed to match one universal specification.