"Waterproof backing" refers to a material or layer that doesn't allow water to pass through it.
Sentences with «waterproof backing»
The durable, poly / cotton blend cover has a food - grade waterproof backing. (colgatekids.com)
It's made with plant - based oils instead of petroleum - based ones and features waterproof backing and inverted seams for extra convenience and a sleek appearance. (sweetmomsblog.com)
The three layers of protection are extra absorbent and the vinyl waterproof backing helps eliminate liquid leaking through. (pottytrainingconcepts.com)