The Impinda is the one non-locking knife in the lineup, and it exists because Tim Reeve and Bill Harsey set out to build a modern slipjoint properly. There is no frame lock here. What holds the blade is a patent-pending spring with deliberately uneven tension, roughly a pound of pull to open and closer to five to close it, so the knife opens easily but actively resists folding on your hand. That asymmetry is the whole design, and it earned the Impinda American Made Knife of the Year at its release. It is the rare slipjoint engineered rather than traditional, built to the same tolerances as the locking models without the lock.
The non-locking blade is the reason to buy this knife, not a compromise to overlook. A slipjoint carries legally in places where a locking folder does not, which makes the Impinda the Chris Reeve you can take into far more of daily life without thinking about it. It is a two-handed knife by design, slower than a flipper on purpose, with sleek titanium handles and a leather slip case rather than a hard sheath. For the buyer who wants the brand's build quality in a knife they can carry anywhere, this is the one model that does it.