The Baseball Windjammer comes in one size, which fits all our Baseball variants, i.e. 19/20mm, 21/22mm and 24/25mm.
Weighing just 15g*, the Baseball Windjammer adds very little extra size or weight when fitted to the Baseball. Adding a Baseball Windjammer to the Baseball brings a very useful extra 10dB of wind noise attenuation, across the spectrum.
So, the performance of the Baseball with the Windjammer fitted is -40dB wind noise attenuation, across the frequency spectrum.