The seating comprises a fibreglass shell and steel frame, covered in stretchy fabric.
Pieces of foam are inserted into pockets in the cover, resulting in a quilted appearance.
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Here's some text from Established & Sons:
Quilt by Ronan & Erwan Bouroullec
The visual appearance of comfort is articulated through the unusual upholstery of the Quilt series of chairs and sofas. A pocketed outer layer, constructed from hi-tech stretch fabric, has individual foam pieces inserted within it.
This outer layer is texturally rich and inviting. Like a quilt or rug, it is then placed loosely upon a fibreglass shell and steel frame. The Quilt chair is an antithesis to the formal, structured sofas and seating designs we have become familiar with.