Changes from the D2 to the D3:

- Added EPS foam for more protection. Approximately 1/4 inch more all around.

- Added more vents for air flow. The D2 features 8 vents, the D3 has 20.

- Aerodynamics have been increased for less wind resistance.

- All screws, bolts, and buckles are Titanium.

- 3 years in development.

- Only 100 grams heavier than the D2.

- Is going to cost $450 American.

- Released in October 2009.