Waterproof PUL Layer Myths: Do You Really Need It?

By Honour Your Flow | Published: 2026-10-31

Category: How-to Guides

Separate fact from hype: when a waterproof PUL layer helps, when it doesn't, and how pads without PUL actually manage absorbency and leaks.

Quick answer

No, a waterproof PUL layer is not mandatory for every pad or every flow. A no PUL reusable pad can work well if it is designed with enough absorbency and changed often, but it will not give the same back-barrier protection as a pad with PUL.

Why the PUL question gets so confusing

PUL stands for polyurethane laminate, a thin waterproof membrane often bonded to fabric. It stops liquid from passing through the pad's backing. But not all reusable pads include it, and that is intentional. Some people want a fully plastic-free pad, while others prioritise maximum leak security. The right choice depends on your flow, your comfort with frequent changes, and how you plan to use the pad.

The trade-off: protection versus plastic-free design

A waterproof layer period pad gives you a clear backup: if the absorbent layers are saturated, the PUL film slows or stops liquid from reaching your underwear. The trade-off is that PUL is a synthetic material, so a pad with PUL is not fully plastic-free. Pads without waterproof PUL usually rely on extra absorbent layers and frequent changes instead. They can feel lighter and more breathable, but they demand more attention to changing timing.

When a no PUL pad is a smart choice

A no PUL reusable pad can be a good fit for lighter flow days, for backup inside period pants, or for anyone who prioritises a plastic-free pad and is comfortable changing every few hours. It is not the best match for very heavy flow, long wear without a change, or overnight use if you tend to flow heavily. If you are unsure, start with a no PUL pad on lighter days and keep a PUL-backed pad for your heaviest days.

Myth verdicts

Myth: Every reusable pad needs a waterproof PUL layer.: Verdict: False. PUL is one way to add a back barrier, but pads without waterproof PUL are a valid design for lighter flow, plastic-free preferences, or use as an extra layer inside period pants. Match the pad to your flow and change schedule, not to a blanket rule.
Myth: A pad without PUL cannot absorb anything.: Verdict: False. PUL-free pad absorbency comes from the fabric layers themselves. A no PUL reusable pad can hold liquid, but without a waterproof back, saturation can pass through more readily. Check the absorbency rating and change before the pad is saturated.
Myth: PUL-free pads never leak.: Verdict: False. Any pad can leak if it is worn too long or if flow exceeds its capacity. A waterproof layer period pad reduces the risk of back-through leaks, but it does not make a pad leak-proof forever. Treat PUL as a backup, not a licence to delay changes.
Myth: If you want plastic-free, you have to accept leaks.: Verdict: Not necessarily. You can use a no PUL reusable pad on lighter days or as a booster inside period pants, and switch to a PUL-backed pad for heavy flow or overnight. A mixed stash often works better than forcing one pad type to do everything.

Product facts

Black Velour Regular pad - NO Waterproof PUL Organic Cotton Reusable Period Pad: This pad has NO WATERPROOF layer and is made for customers who want a fully plastic-free pad. It is a genuine no PUL option, so you can test PUL-free absorbency without guessing whether a hidden waterproof film is present.
Black Velour Regular pad - NO Waterproof PUL Organic Cotton Reusable Period Pad
Black Velour Regular pad - NO Waterproof PUL Organic Cotton Reusable Period Pad: Instead of a waterproof PUL layer, it has an extra top layer to help spread the load. The extra layer is designed to manage liquid distribution, but it does not replace a waterproof barrier, so change timing still matters.
Black Velour Regular pad - NO Waterproof PUL Organic Cotton Reusable Period Pad: It is suitable for average menstrual flow days and can be used inside period pants for extra absorbency. That makes it a practical choice for moderate flow or as a booster, not as a standalone solution for heavy flow or long wear.