Kasper Salto designed Fritz Hansen's NAP series in 2010. KS52 is the model without armrest and comes in several colors. The back of the shell has a high gloss finish, while the front is in matte nylon with a smooth texture that maintains the curved shape of the chair and adapts naturally to the body. The legs are made of oak wood.

When Salto designed the chair, he wanted the user to be able to sit comfortably in any position. The name NAP is an abbreviation of normal, active, and passive, the three main seating positions. Kasper Salto's design concept is a tasteful combination of classic Danish design and influences from international industrial design, as exemplified by the KS52 chair.