Spunbonded fabrics are used on low tunnels to protect against frost. They’re not a fabric like a cloth fabric you might think of, but a very light web of poly fibers stuck together.
Insect netting has no heat retention properties. It looks and feels like a soft, flexible window screen, and comes with different mesh opening sizes to deal with different insects.
Bird netting has wider mesh openings that are large enough for some insects to pass through, but small enough to keep birds (and other small pests like rabbits) from nibbling on tender transplants.