Mizuno T10 Volleyball Kneepads
When diving, you're only falling a few feet to the floor, not from a rooftop - you don't need THAT much padding. These kneepads protect your kneecaps while still remaining slim (a bubble on your knee is never cute) and light-weight. Once you wear these multiple times, they will really mold to your knees. These come in both white and black; choose whichever color looks best with your uniform. White kneepads tend to look more professional, although they do show the dirt faster, but these kneepads are so reasonably priced that buying a fresh pair each season isn't a problem.