My nylon Columbia zippoffs have what looks like a bleach spot (color changed or gone).
My nylon REI zippoffs have the same spot. http://www.rei.com/product/746908
My nylon Dick’s sporting good zippoffs have the same spot.

The common thing: they are all the khaki color. The spot location is random. I do not use bleach in my washing machine; just some mild liquid soap.
My blue or green zippoffs do not get the bleach spot. They are steadfast.

So I’m wondering- is it the khaki dye, on nylon, that can’t take a lickin and keep on tickin?

Thanks,
-Barry