Why We Use YKK Two‑Way Zips
At Hoolies, we believe the smallest details make the biggest difference. That’s why our sleep sacks are finished with premium YKK two‑way zips – smooth, safe, and trusted worldwide.
What Makes YKK Zips Special
- World‑renowned quality: YKK is the global leader in zips, used by luxury brands for reliability.
- Smooth & snag‑free: Designed to glide easily, even during quick nighttime changes.
- Durable: Built to withstand countless washes without losing function.
- Safety first: Rounded edges and precision finish reduce the risk of scratches or irritation.
- Two‑way convenience: Change nappies or adjust comfort without fully removing the sleep sack.
Caring for Your Zips
- Gentle wash: Machine wash on a normal or delicate cycle in cold water.
- Zip up first: Always close the zip before washing to protect teeth and fabric.
- Avoid harsh chemicals: Skip bleach or strong detergents that can weaken the mechanism.
- Air dry preferred: Helps maintain smooth function; if using a dryer, keep heat low.
- Check regularly: Run the zip a few times after drying to keep it moving freely.
Our commitment to quality and safety is reflected in every detail, making our onesies a reliable choice for your little ones.


