Frequently Asked Questions | ZILK Sleep
The Science of Silk
What is ZILK?
ZILK is where beauty, sleep, and wellness meet. Founded by a board-certified Physician Assistant, ZILK blends medical insight with modern design to turn nightly rest into a restorative ritual. Each product is made from 25-momme Mulberry silk enriched with silver ions to support clearer skin, smoother hair, and calmer sleep.
What are ZILK products made from?
Every ZILK piece is made from 100% 6A-grade Mulberry silk — the highest quality available — with a dense 25-momme weave for strength, smoothness, and durability. Each fiber is infused with SILVADUR™ silver-ion technology from DuPont to help resist bacteria and odor.
What is SILVADUR™ silver-ion technology?
SILVADUR™ is a smart-release silver-ion system by DuPont that helps resist odor-causing bacteria and maintain freshness through many washes. It bonds directly to silk fibers for lasting performance that’s gentle on skin and the planet.
Are silver ions safe?
Yes. SILVADUR™ is OEKO-TEX® and bluesign® approved, non-irritating, and safe for skin contact. The silver ions are securely bonded at the fiber level, meaning they won’t wash away or enter waterways.
Will silver-ion protection last forever?
Like all textiles, it will naturally soften over time. However, SILVADUR™ technology has been tested to maintain >99.9% bacterial resistance even after 50 washes.
Benefits + Results
What are the benefits of sleeping on silk?
Silk naturally reduces friction and absorbs less moisture than cotton, helping preserve skin hydration and hair smoothness. ZILK’s silver-ion infusion adds an extra layer of freshness for clearer skin and calmer rest.
Does ZILK silk help with acne or irritation?
Yes. The silver-ion infusion helps resist bacteria that contribute to breakouts, while silk’s smooth surface minimizes friction that can irritate skin.
Is silk better for hair?
Yes. Silk’s frictionless surface helps reduce tangles, frizz, and breakage while preserving your hair’s natural moisture and style.
Does ZILK silk help regulate temperature?
Yes. Silk is naturally thermo-regulating — it helps keep you cool in warm weather and cozy in cooler conditions for balanced, comfortable sleep year-round.
Care + Maintenance
How should I wash my ZILK silk?
Hand wash in cold or lukewarm water with a pH-neutral silk detergent. Or, machine wash on a delicate cycle in a mesh bag with like colors. Avoid bleach and fabric softeners. Lay flat or hang to air dry.
Can I machine wash ZILK silk?
Yes, using a mesh bag and delicate cycle. Hand washing is recommended for smaller items like sleep masks and scrunchies.
Can I tumble dry silk?
No. High heat can damage silk fibers and dull the luster. Always air dry.
Can I iron or steam silk?
Yes. Use low heat while the fabric is slightly damp, or use a handheld steamer. Always turn inside out or use a pressing cloth for protection.
How often should I wash my pillowcase?
Every 7–10 days is ideal. Thanks to silver-ion freshness, ZILK silk stays cleaner longer than cotton.
Orders + Shipping
Where does ZILK ship from?
U.S. orders ship from Illinois; EU orders ship from the Netherlands.
Do you ship internationally?
Yes — to the U.S., Canada, and EU, with more regions coming soon.
What is your return policy?
Returns are accepted on unused, unwashed items within 30 days of delivery. Email support@zilksleep.com for a prepaid label.
How long do refunds take?
Refunds are typically processed within 5–7 business days once the return is received.
Brand + Sustainability
Who founded ZILK?
ZILK was founded by Elizabeth Cook, a board-certified Physician Assistant and aesthetic expert who believes rest is the most overlooked form of self-care.
What does “Science of Silk. Ritual of Restoration.” mean?
It’s our brand promise: combining measurable silk science with mindful ritual to restore your skin, hair, and rest.
Is ZILK sustainable?
Yes. Silk is a renewable, biodegradable fiber. We use eco-certified dyes, closed-loop water systems, and recyclable packaging printed with non-toxic inks.
Is ZILK cruelty-free?
Yes. All ZILK products are cruelty-free and ethically produced by partners who meet strict labor and environmental standards.
Still have questions?
We’re here to help. Email support@zilksleep.com or follow @zilksleep for silk science tips and updates.
