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Well, here's my theory. Maybe the lighter the color, the denser the material they chose so it wouldn't absorb dirt. The black one can be soft and light without picking up dirt. The white one needs to be harder, less porous, meaning it's denser.

I don't know.
 
Well, here's my theory. Maybe the lighter the color, the denser the material they chose so it wouldn't absorb dirt. The black one can be soft and light without picking up dirt. The white one needs to be harder, less porous, meaning it's denser.

I don't know.

Nice theory. If true, this is yet another example of how attentive they are. No other company would vary the density of the bands.
I love finding out these little details.
 
or maybe they just needed something fill the marketing gaps. e.g. they have four lines to fill

SS
Stainless steel
Durable
Looks great
Easy to clean

Sport
Rubber
Durable
Sweat Resistant
er....only 10 grams!!
 
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