This is for the corner of a well made sectional with two lumbar pillows and dense comfortable seating. There are metal brackets that attached for joining to the rest of the sectional, but these can easily be removed with a screwdriver for a cleaner look. See in house photos for details. 

https://www.wayfair.com/furniture/pdp/ebern-designs-icelyn-3-piece-modern-and-soft-upholstered-corner-sectional-with-6-throw-pillows-fdxy3020.html

40x40x22

Solid + Manufactured Wood, Coil Spring, Pocket Spring