They don't let water through.
not waterproof
It is strechy and waterproof
newspaper
Waterproof material is material that can withstand water. Waterproof material will not be damaged by the wetness of water being on it.
Yes, tarps can be waterproof, but not all tarps have waterproofing properties. It depends on its material and construction.
What exactly are you planning to waterproof?
Cementuous materials are not waterproof. Hydraulic cement is the closest they come, but even it becomes saturated.
Cohune Palm
The Velcro material itself is not waterproof, however it is available with adhesive which is waterproof, so it can be used on materials that are constantly or often wet or underwater. A velcro 'seal' or interface is also not waterproof.
Kevlar is a fiber that is knitted or woven into a material/fabric. Those materials can be laminated to be made waterproof, but Kevlar in and of itself as a finished good is not waterproof.
The best waterproof and weatherproof materials are the ones that say waterproof and weatherproof on the packaging. Then you can leave your lawn furniture out all year long.
they are mostly stuff like rian gear.