Because One Size Doesn't Fit All.
The Perfit Contour Mouse is the only input device designed to fit your hand. When you buy shoes or gloves, you try them on and buy the ones that fit and are the most comfortable. Why should a mouse be any different? All other input device companies would lead you to believe one-size-fits-all; we don't follow this philosophy. Our research has proven that a one-size-fits-all device does not reduce an individual's pain or stress on their hands.
We spent over a year performing clinical testing on users. We tested over 100 different shapes and sizes in order to guarantee the proper support and fit. In order to properly support the hand in a relaxed neutral posture, a precise fit was necessary. This is why Contour offers four right-hand sizes and three left-hand sizes.

The Perfit Contour Mouse has been awarded the highest award from the International Ergonomics Association (IEA) by the largest gathering of ergonomics professionals worldwide.
The Perfit Mouse is also endorsed by many of the top Certified Professional Ergonomists (CPE). Ask any Perfit Mouse user who understands ergonomics and you will find that most believe this is the best product ever made.
800dpi Precision Optical Tracking

Twice the tracking precision of many other optical mice. No performance degregation due to dirt buildup like "ball" style mechanisms.
Multiple Sizes for both left and right hands
The Perfit Optical Mouse is available in Small, Medium, Large, and Extra-Large for the right hand and Small, Medium and Large for the left hand.
Sculpted Elevated Buttons
This enables the hand to remain open with the fingers extended in a ready position for quick button activation. Buttons are elevated and shaped to reduce excessive load on the fingertips.
Thumb Support with Integrated Scroll Wheel & Two position rocker switch
This gives the user added support, control and comfort. It alsp allows you to move the mouse with reduced pinch force which is known to increase the risk of Carpal Tunnel Syndrome. The scroll wheel provides scrolling and the textured, rubber-coated light touch two position rocker switch provides access to additional repetitive commands.
Elevated Wrist Support
Reduces pressure on the wrist by keeping it off the desk top. Maintains a straighter wrist alignment and minimizes Lateral Deviation. Balances the hand in a neutral, tilted posture. Prevents static grip by allowing the hand to rock freely.
Multiple Platforms
The Perfit Optical Mouse supports both PS2 and USB connections, providing support for the majority of computer systems.
Programmable Software
Using our software enables you to customize the Perfit Mouse Optical and accomplish tasks faster and easier. Set the buttons individually.

Measure from the crease at the base of the palm to the tip of the middle finger.
- Small for hands les than 6 3/4"
- Medium for hands 6 3/4" to 7 1/2"
- Large for hands 7 1/2" to 8 1/4"
- Extra Large (right-hand only) for hands larger than 8 1/4"
Compatibility: Windows 95, 98, 2000, and XP
Connector: USB (USB to PS/2 adapter included)