Expand your comfort zone with this innovative and powerful device. With smart oxygen delivery, unmatched comfort and a durable design, you can experience a new standard in portable oxygen. The Freestyle Comfort's lightweight, curved design hugs your body, so you’ll hardly know it’s there. It has the power to let you stay out all day long with greater flexibility to increase flow rates as your prescription changes. Patented smart oxygen delivery features ensure you get the oxygen you need, when you need it, keeping you comfortable and worry-free by adjusting to your automatically breathing patterns and level of activity.