While the aluminium structure of all of the chairs is the same, five upper portion unit variations feature differing shapes, colours, and materials. A number of different shapes and sitting experiences are achieved by fitting these units onto the four legs to create a T-shape on the tops of the legs, connect sections, or add a high or low backrest.

Choices for seat material include wood, plastic, and fabric. When the seat and upper portion is removed, the aluminium frames of multiple seats can be stacked, making storage convenient and reducing potential transportation costs.