Both nylon and polyester webbing have a low water absorption rate, making them flexible, light, and easy to handle even after prolonged soaking in water. Both also show excellent resistance to most mildew and fungus, although dirt that accumulates on slings may support their growth, and that's why regular cleaning is very important.
Inspect your sling before each use since tensile strength may decrease with each use. Web slings should be stored in a cool, dry, and dark place.