The DaKine Nitrous HD has been improved with an updated spreader bar, which has a push-button release as well as better sizing. The Nitrous has developed a strong following for those that enojy the feel of a seat harness without bulkiness. This makes the Nitrous arguable the most comfortable seat harness on the planet. The shorts are also incredibly compact when packed-up, which makes them great for travel as either a primary or secondary harness. The Nitrous HD harness is also compatible with the Maniac and the Option spreader bars.