About A Chair AAC 212 Chair by Hee Welling

HAY describes the AAC 212 as having "a wooden base with round legs, with an organic and timeless aesthetic," along with "a shell with a slightly higher backrest" and "a deep, generous seat." A design point to note: the armrests are low: they support the forearm while allowing the chair to slide under a table or desk.

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 mass-dyed: a scratch does not reveal a different color underneath, and maintenance is limited to soapy water. On light shades, slight variations in hue are inherent to recycled material.

Solid oak, and why it is mentioned here

The base of this model is 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 models are mounted on oak veneer. With solid wood, you can see the grain continue over the edges and it can be sanded down; a veneer is a thin sheet glued onto a backing.

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