🩲 Why Swim Diapers Shouldn’t Have a Waterproof Layer (And Why We Don’t Recommend It)
When it comes to swim diapers, there’s a bit of debate in the parenting world about whether a waterproof layer is necessary—or even helpful. At Cloth Joy, we’ve done the research and testing, and our recommendation is clear:
Swim diapers should not include a waterproof layer.
Here’s why:
Waterproof = Waterlogged
A waterproof layer, like PUL (polyurethane laminate), is designed to trap liquid. That’s great for everyday diapers—but not in the pool. Once a diaper with a waterproof layer is submerged, it can trap water inside, making the diaper heavy, saggy, and uncomfortable for your little one. In some cases, this added weight can even interfere with a baby’s movement or floatation support.
The Real Purpose of a Swim Diaper
Swim diapers aren’t meant to absorb urine—that’s a common misconception. Urine passes freely through both disposable and reusable swim diapers in the water. The real job of a swim diaper is to contain solid waste, plain and simple. And for that, a snug fit around the legs and waist is far more important than waterproofing.
Some Say It’s Fine—Here’s Why We Don’t Agree
Yes, you’ll find some reusable swim diapers on the market that include a waterproof layer. Some parents report no issues. But in our experience, and through feedback from our Cloth Joy community, we’ve found these designs often lead to:
Bulky, sagging diapers after just a few minutes in the water
Increased discomfort and chafing
Longer drying times
Less effective containment due to poor fit from added weight
That’s why Cloth Joy swim diapers are designed without a waterproof layer—so they stay trim, lightweight, and secure, even after an hour in the pool.
What to Look For Instead
The best swim diaper is one that:
Has a breathable, quick-drying fabric
Offers a snug, adjustable fit at the waist and thighs
Is easy to clean and reuse
Our swim diapers check all those boxes, keeping your little one safe, comfy, and carefree while you enjoy your time in the water—without any unnecessary bulk.
