The Sunrise Nitrum is an upgrade to the highly regarded Sunrise Helium. It boasts a much improved price point, not to mention some serious refinement too. The Nitrum has the tag as the lightest adjustable aluminium on the market, with a mere 5.2 kg lifting weight (7.5 kg total weight). In reality other manufacturers chairs do compete with this light weight headline as its not always apples withapples in terms of how chairs get weighed. The Nitrum is a very impressive wheelchair for those after a high end chair.