The Helium is designed for active people for use indoors and out. Constructed of high-strength aircraft aluminum and titanium, the Helium is the lightest stand-up wheelchair in the world. Brilliantly engineered, this ergonomically-friendly standing system incorporates gas struts that deliver the safe and easy lift you need to put you eye to eye with your friends and family. To stand-up, the user grasps the side handles for forward propulsion. This arm movement, helped by the gas struts, allows you to stand with amazing ease!
More information: http://www.permobilus.com/helium.php