The main difference between the Hawk gaming chair and the Ultra gaming chair models are the dimensions and features. The Hawk gaming chair was designed for small to medium users in mind, with a maximum height of 200 cm and weight of 110 kg. The Ultra gaming chair is capable of supporting users with a height of up to 200 cm and weight of 130 kg. The Ultra gaming chair is also more advanced with features such as built-in adjustable lumbar support for additional comfort.