Performance, regulatory requirements:

1. The comfort

2. The sealing, thermal insulation, noise resistant

3. The manipulation convenience

4. View sex

5. Take down convenience

6. Driving safety

7. Repair convenience

The layout design.

1. The external size (size) for vehicle

2. The wheelbase, wheel track

3. The engine position and baffle position

4. The wind window position

5. Basic options (such as air conditioning, DVD) position

6. Driving, take position