"Built in target and terrain analysis aids gun accuracy and movement speed"
The Dragonfly Helmet is part of the Shotlite Dragonfly set manufactured by Shotlite. Its an improved variant of the Shotlite Hummingbirdhelmet. The helmet is a good choice in the later levels due to its good defense, gun damage boost, and movement buff. It is a comparable nemesis of the Titan IRN HUD; while the IRN HUD has better defense and provides more gun damage, this adds movement speed instead of taking it away and is therefore an excellent choice for speed-oriented builds.
The Dragonfly Helmet, unlike other helmets, has no transparent visor to look through. According to the description, it likely generates an image of the surrounding terrain to the wearer, and also tells the wearer where to step for maximum traction, which is probably the reason for its movement buff.