Arjohuntleigh First Step Select User Manual page 30

First Step Classic™ MRS - a 4 in low profile overlay that fits on top of an existing mattress.
First Step Excel™ MRS - a 7 in deep surface with a 3 in thick therapeutic foam base for a Complete mattress replacement system
(mrs).
First Step AirRail™ MRS - a 5 in overlay that fits on top of an existing mattress, with air rails designed into the left and right edges
of the overlay, extending 1in to 1-1/2 in above the overlay.
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