As Powerbooks have gotten smaller, thinner, and more powerful, they have also gotten hotter. That heat can make the top and bottom panels uncomfortable to touch, and can, over time contribute to deterioration of your Powerbook's performance and reliability. Also, using a Powerbook on a standard height desk surface requires lifting your elbows and curling your fingers down to the keyboard... a decidedly unnatural posture. The iBreeze lifts the rear of your Powerbook just enough to match the natural angle of your arms, and avoid much of this physical stress and discomfort.