A deeper pillow-top build with two mini pocket-spring comfort layers.
Royal Imperial is the more layered Atelier model. Its pillow-top construction combines baby foam and 4030# foam with two mini pocket-spring comfort layers above the main pocket-spring support core.

Royal Imperial has the deeper, more layered construction in Atelier. Compared with Royal Prestige, it moves to a pillow top and adds a second mini pocket-spring comfort layer.
Consider Royal Imperial if you…
A 13-inch pillow-top build adds more depth than Royal Prestige.
The comfort build specifies 1.1 mm and 1.3 mm bread mini pocket-spring layers.
The 2.0 mm pocket-spring support core is specified with 7 cm foam encasement.
Moving down to Royal Prestige: choose the simpler / lower construction if you do not need the added layers or top-design changes in Royal Imperial.
Royal Imperial is the deepest / most layered endpoint in this series based on the current specification; move down if you prefer a simpler build.
Size and warranty details are pending confirmation and are not shown here.