That's part of the manufacturing process of the Dyneema® material. Sheets of mylar are bonded together, then the Dyneema® strands are laid on top of that mylar sheet. Its more visible on the Green material, since its more see through than the camo, but all Dyneema® composite material will have those vertical lines. Please let me know if you have any additional questions.
Best Regards,
Harry Carlson
Customer Support / Product Specialist
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