ERGO K860's curved key frame places your hands, wrists, fingers and forearms in a more natural posture - you'll notice the lack of tension the moment your hands land on the keyboard. ERGO K860 has even been shown to reduce muscle activity by 21% in the upper trapezius muscle 2 compared to a traditional Logitech keyboard without a palm rest, a key muscle in the center of the back that stabilizes and facilitates shoulder and neck movement.