Sound Barrier is a gear perk that greatly raises walking and sprint speed and improves stamina. It is one of the strongest movement perks, ideal for getting around on foot and dodging fire.
Dani moves much faster at every pace and tires less. You cross open ground quickly and reach flanks before enemies can turn.
Wear the Lightspeeders in the feet slot. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Yes for almost any build. Few feet perks help as much in day-to-day play.