The products are measured by hand within the margin of 1-2cm error.
Out of the environmental concept, the mat is packed with reel form.
The mat needs to be placed for some time in a warm place to recover its original shape because of PVC material characteristics.
The rolled mat will take some time to flat after unwrapped, but EVA mat has good flexibility. You can roll it the opposite way. An iron and a damp cloth are helpful also for flattening things that must not get too hot.
The mat is bluish because of light refraction which is normal and please don't worry.