About A Chair AAC 12 chair by Hee Welling

HAY describes the AAC 12 as "a gently curved, open shell and a symmetrical solid base," noting that the absence of armrests provides a clean, clutter-free silhouette. At 51 cm wide, it is the narrowest model in the wooden-base family, making it the easiest to tuck around a table.

The shell: recycled polypropylene, what HAY calls "2.0"

The seat and backrest form a single injection-molded shell made from post-consumer plastic waste: this is what the "2.0" in the color names refers to. The material is dyed throughout: a scratch will not reveal a different color underneath, and maintenance is limited to soapy water. On lighter colors, slight shade variations are inherent to recycled materials.

Solid oak, and why it is mentioned here

The base of this model is made of solid oak: not veneer. The HAY product sheet explicitly states this (Water-based lacquered Solid oak), and the distinction is worth making: in the same series, the AAC 22, 23, 123, 222, and 223 are mounted on oak veneer. With solid wood, you can see the grain continue over the edges and it can be sanded down; veneer is a thin sheet glued onto a base material.

However, be careful not to draw a price hierarchy from this: in this series, it is the shell that accounts for most of the price difference, not the wood species of the base. The lacquer is water-based, solvent-free, and available in a natural or black-stained finish.