The Grand is high-end and is part of the Perfect Relief Collection, with pocketed coils.It has a height of about 12 inches and is a flip-free box top.ACQ technology has been used in this mattress.The Advanced Comfort Quilt Technology blends in sophisticated convoluted layers of quilting to the mattress, creating specialized comfort zones. Each of these quilted types has a relatively denser zone in the centre one-third, providing additional support to the spine. Lush layers of polyester wadding passes through the Foam convolutions to provide supreme comfort. The ACQ layers are unique for the plush, luxurious feeling and breathability. The padding layers has convoluted foam layer which has pockets of air to provide high levels of comfort and also Visco-Gel layer to provide additional comfort. The stretch fabric also provides good feel.