Humanscale's Cinto Stacking Chair (2006) offers affordable, environmentally conscious ergonomic seating. Stackable up to eight high, Cinto – or "belt" in Spanish – features a flexible polypropylene back that's connected to the frame with an elastomer belt to provide mobility and lumbar support. The polypropylene seat has surface cutouts that flex independently under the sitter’s weight. Equally innovative is the chair's minimal environmental impact: Cinto is designed to be 100% recyclable.