Cy underwear is crafted exclusively from fabrics that are OEKO-TEX® STANDARD 100 certified, ensuring they are free from harmful chemicals and dyes.

The Essential Collection is made from premium LENZING™ micromodal, a fabric known for its ultra-soft feel, breathability, and moisture-wicking properties. Micromodal is a sustainable fiber sourced from beech trees. Every pair of Cy underwear features a 100% organic cotton gusset to support your intimate health, as recommended by gynecologists.

For optimal care, we recommend washing your Cy underwear on a cool wash and tumble drying on low or air drying. Please avoid ironing or dry cleaning.

We currently ship to all 50 states in the United States, US Territories, APO/FPO, and Canada.

Within the USA:

• Standard Shipping is available for most domestic locations (3-4 business days after fulfillment).
• Standard Shipping is free for all orders over $75 within the continental USA (excludes Priority Shipping Methods).

To Canada:

• Standard Shipping is free for all orders over $100 CA Canada (excludes Priority Shipping Methods).

We process and ship orders Monday through Friday, excluding holidays. Most orders placed before 12 PM ET will ship the same day, but please allow 2-3 business days for processing, especially during high-order volume periods. Once your order ships, you’ll receive a tracking number via email. Please note it may take up to 24 hours for tracking updates to appear, depending on the carrier.

Delivery Estimates:

• USA: Delivered within 1-5 business days after fulfillment.
• Canada: Delivered within 3-7 business days.

Note that we are not responsible for carrier transit or customs delays.

Yes! We currently ship to Canada. 

Please note: we do not offer free returns for store credit for International Orders at this time. 

Canadian duties are covered in the cost of your shipment, so you won’t need to pay duties or clearance fees. Tax will be added separately at checkout.

To start a return, email us at hello@thecyunderwear.com (with your order number) within 30 days of receiving your order. We’ll assist you as quickly as possible with any returns or questions you may have! Please note: Original shipping charges are non-refundable.

For U.S. Orders, we offer free returns for store credit within 30 days. For refunds to your original payment method, a $7 return fee will apply. Unfortunately, we do not offer free returns for International Orders at this time, a $20 return shipping label will apply.

Products should be returned in their original condition—new, unworn, and unwashed—with all tags and packaging included. When trying on your purchase, we kindly ask that you wear underwear to ensure it’s eligible for return, as we may need to decline returns that show signs of wear.

Please allow up to 15 days for returns to be processed.

Our fulfillment center works quickly, so we’re often unable to make changes to orders once they’re placed. If you need to cancel or adjust your order, please reach out to us right away at hello@thecyunderwear.com with your order details. We’ll do our best to help, but we can’t guarantee changes after an order is submitted.

We currently accept all major credit cards (American Express, Discover, MasterCard, and Visa) as well as PayPal and Apple Pay. 

We’re not perfect—but we’re committed to minimizing our impact on the planet. That’s why we use only consciously sourced fabrics, certified to meet the OEKO-TEX® STANDARD 100. This ensures they are free from harmful chemicals and dyes, protecting both people and the planet. We partner with independent factories that share our values and help us innovate with fabrics designed to support your intimate health while reducing environmental impact. Plus, all of our packaging is made with recyclable materials—because every step counts.

Yes! We donate 1% of our proceeds to the Society for Women’s Health Research (SWHR), a leader in advancing women’s health through science, policy, and education. For over 30 years, SWHR has worked to close research gaps, raise awareness of women’s health issues, and advocate for better health outcomes. At cy, our impact goes beyond your intimates.

A: Fit and fabric are the most important factors. Your underwear should fit well—not too tight, without digging into seams or riding up (especially in the crotch area).

Breathable fabrics are essential for comfort and health. Organic cotton and sustainable options like our micromodal are great choices. Our micromodal is OEKO-TEX® certified, meaning it’s free from harmful chemicals. It’s also naturally moisture-wicking to keep you dry, and our gussets are lined with 100% organic cotton for an added layer of protection.

A: Thongs often get a bad rap, but here’s the truth: while there’s a theoretical risk of cross-contamination, research says otherwise. A 2019 study in the Journal of Obstetrics and Gynaecology Research found no link between frequent thong-wearing and UTIs, yeast infections, or BV.

However, the study did find that non-cotton crotch linings were associated with yeast infections, which is why all our gussets are lined with 100% organic cotton. To stay balanced, we recommend alternating with full-coverage styles like our Bikini or Cheeky and skipping thongs while sleeping (because let’s be honest—they’re not exactly comfy for bedtime).

A: To go commando or not? It’s a personal choice! As one gynecologist put it: “Is sleeping in a clean pair of pajamas any different from sleeping in a clean pair of briefs?” Fair point.

The key is breathability. Full-bum styles like our Essential Bikini or Brief are great options for nighttime comfort

A: It’s simple: follow the care label and avoid harsh or scented detergents and fabric softeners. For extra precaution, do a double rinse cycle, and you’re good to go!

A. Best practice, according to research, is every 6–12 months, but it really comes down to wear and tear. Choosing high-quality underwear and following care instructions can help extend their lifespan.