This is technically a replacement cushion for a specific RH indoor upholstered dining chair however the size and fabric make it ideal for an outdoor dining seat cushion.   It is designed for RH's Belgian Slope Arm Slipcovered Dining Side Chair.  It has a gently curved back that sits against the back of the chair and has metal loops to attach to a chair so it doesn't slide.  It features fabric from the Perenials Textured Performance collection which is known for it's stain and fade resistance. 'Natural' is a nice neutral color with white and off-white threads woven for a tone-on-tone look.

I have multiple cushions available-happy to make a deal if you want to purchase a set!