The body of the Blue Oasis Guitar Humidifier is made from a specially designed fabric that allows water vapor (but not water) to pass through it. As the vapor transmission takes place, a vacuum is created and Oasis shrinks to compensate for the loss of water. By watching the Oasis humidifier shrink, you can determine when it is ready for refill. When refilling, you don't have to guess when it is full. Simply unscrew the black cap, fill with water to the top of the container and replace the cap. Once sealed, the watertight container is your first line of defense against leaks. Humigel, the super absorbent polymer crystals inside the Oasis Humidifier, are your second line of defense. Humigel captures up to 500 times its weight in water in an absorbent gel matrix.

Like other sound hole humidifiers, Oasis fits between the strings of your instrument. The materials that touch your strings are relatively soft and will not scratch your strings. A blue polyurethane stabilizing bar fits over the neck of the guitar humidifier. Once positioned in the sound hole, the stabilizing bar lies across the guitar strings to ensure even weight distribution. Oasis never touches the body of your guitar.

For normal seasonal humidification (down to 25% relative humidity), most guitarists can rely on the original Blue Oasis. The Oasis provides humidification for 7-10 days before needing to be refilled.