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.
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