HIRO Diapers

Unbleached cotton retains its natural waxes and oils, which makes it naturally hydrophobic and ultra-soft against baby’s skin. It skips harsh processing and showcases the true texture of nature—safer for baby, gentler on the planet.

We intentionally removed the wetness indicator (aka the blue line) because it contains Bromothymol Blue, a chemical we choose not to include. It was invented to drive consumption, not because parents asked for it. HIRO Diapers are free from this and other unnecessary additives. Read more in The Truth about Diapers.

Yes. HIRO Diapers use less plastic without sacrificing performance. In third-party lab tests, our diapers matched or outperformed leading natural brands in absorbency, dryness, and speed—keeping babies dry for up to 12 hours, day or night.

Nope! While foodgrade safe, the SuperHIRO Mycelium only come into play after diaper disposal. You drop a HIRO Pouch into the soiled diaper—never in direct contact with baby—and that’s when the fungi get to work breaking down waste.

HIRO Diapers are hypoallergenic, dermatologist-tested, and made with super soft, breathable materials that keep baby’s skin dry and comfortable. They’re free from harsh chemicals, chlorine, bromothymol blue wetness indicator, fragrances, lotions, and dyes—all common irritants that can lead to diaper rash.

Yes. HIRO Diapers go beyond the industry standard and are made with absolutely no chlorine bleaching. Our cotton and pulp are processed using totally chlorine-free (TCF) and oxygen-based methods.

Yes. The Mycelium used in HIRO Pouches are organic, culinary-grade, non-GMO, and never come into contact with your baby. The pouch stays sealed inside the diaper until it’s discarded, where it activates safely in landfill conditions—not in your nursery.

Mycelium are nature’s most powerful decomposers. Our proprietary MycoDigestible™ technology uses a blend of shelf-stable Mycelium that activate when exposed to moisture. These Mycelium release enzymes that break down plastic at a molecular level, transforming it into environmentally safe matter—no microplastics, no greenwashing.

Diaper Ingredients

Absorbent core

• Softwood fluff pulp from sustainably managed forests
• Cleaned using a Kraft chlorine-free process
• Sodium polyacrylate (SAP) for absorbency

Diaper layers & components

• Backsheet: Natural cotton and polyester with recycled content
• Topsheet: Polypropylene
• Acquisition layer: High-loft nonwoven polyester
• Fastening system: Polypropylene/polyethylene, film, and adhesive

Packaging

• Made with up to 25% recycled polyethylene

Topsheet (The Layer That Touches Baby’s Skin)

Material

• 100% polypropylene

What it does

• A soft, breathable nonwoven that stays dry to the touch

Why it matters

• Chosen for its gentleness and low risk of irritation
• Hypoallergenic
• Dermatologist tested
• No bleach, no lotions, no fragrances, no dyes

Looking ahead
Today, we use polypropylene because it delivers excellent dryness and skin safety. We’re actively exploring plant-based, unbleached alternatives that maintain performance without relying on chemical softeners or bleach.

We've decided to discontinue wipes so we can stay focused on what we do best — creating
high-performing diapers that return safely to the Earth. A few reasons drove the decision:

1. Even "99% water" wipes need preservatives. That last 1% has to keep the wipes
   shelf-stable, which means preservative chemistry we don't believe is ideal for your baby's
   most sensitive skin.
2. Wipes work against our fungi. Those same preservatives can inhibit the friendly fungi
   that power our MycoDigestibleTM technology — undermining the very thing that makes a
   HIRO diaper biodegrade.
3. "Biodegradable" wipes aren't really. Even wipes marketed as biodegradable can take
   decades to fully break down, and many never do in the conditions they actually end up in.

Our recommendation: a soft cotton washcloth with warm water at home, and a small
dampened cloth in a wet bag for the diaper bag. We're iterating on a better solution to make
sure all our standards are met.