A waterproof layer refers to a barrier or material that stops water from passing through it. It is designed to keep items or surfaces dry and protected from water damage. Full definition
Perfect fit, sporty style and an additional inner waterproof layer gives you the OK to head out into the outdoors with seat covers that will take the abuse of the elements. (carparts.com)
It also has waterproof layers so that your breast skin can breathe in the hot summer and you do not leave the sweat in clothes. (shrewdmommy.com)
It features a durable waterproof layer concealed within 2 layers of ultra soft polyester fabric so that no laminate touches your baby's skin. (well.ca)