ATV windshield?

I have the kawasaki factory half windshield. It has a little lip on it that helps throw most of the mind up and over instead of right in your face. Not all, you can still feel a good breeze, but it definately helps.

My buddie has a full windshield and it is definately warmer durign the winter - but during the summer it is as well. His also sucks more dirt into the cab with the full windshield on it seems. It gets dirty, I like being able to see clearly, especially at night but its a minor complaint.