About A Chair AAC 14 office chair by Hee Welling

HAY summarizes it as follows: "Although the AAC 14 shares the same sleek, distinctive shell as the rest of the collection, the elegant four-star aluminum base on casters gives it a more functional edge." It is the narrowest of the caster-based models, at 51 cm, and does not have armrests.

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 light colors, slight variations in shade are inherent to recycled materials.

Casters, but no gas lift: the distinction to note

The base is a four-star aluminum star base, mounted on casters, on which the shell swivels. This is what HAY calls a four-star caster base.

This model does not have an adjustment gas lift. The seat height is fixed. This is what separates it from the About A Chair 50, 52, and 252, whose five-star base features a pneumatic gas lift. We mention this because it cannot be seen in a photo, and because it is the primary criterion for a workstation: to adjust the height to a desk, a gas lift is required; to roll from one point to another around a table, casters are sufficient.

Three base finishes: polished aluminum, black powder-coated, or white powder-coated.