Huawei Mate XT Aramid Carbon Fiber Case MagSafe Ultra Thin

Difference between 1500D and 600D:

D: It is a measure of Denier, a unit that measures the thickness of fabric fibers,

equal to the number of mass grams of 9000 meters of fiber.

The larger the D, the thicker the yarn, so the grain of the 600D aramid fiber cloth is obviously finer than the grain of the 1500D cloth.

But which is better depends on personal preference. 

Thickness: 1500D (0.65mm) VS 600D (0.60mm);

The same model 600D is about 2g lighter than 1500D.