Aeron's three size options and adjustability ensure that it fits a much broader diversity of sizes than any competing chairs. Any user from the 1st percentile through to the 99th precentile regardless of gender, can find the perfect fit within Aeron's three size options. The stretch of the pellicle and range of tilt tension are all calibrated to the users weight and size range for each chair size to ensure proper support. Use our Size guide below to work out what size Aeron Chair you require.