There is some information on the NASA site about the sun shield.
See here: https://webb.nasa.gov/content/observatoryThe Sunshield Webb/sunshield.htmlNASA.
In the paragraph on "Special Seaming" it states that there are reinforcing strips about every six feet or so forming a grid pattern of "rip-stops". This limits the damage from a small hole from a meteorite strike and prevents it from tearing the whole shield.
I suggest reading the whole article for more information.