UnderXLabs redefines men’s underwear through precision design and performance engineering. Built for those who value quality and quiet confidence, each piece unites technical innovation with effortless comfort for every moment of the day.

• Thong: A minimalist essential built for a clean, invisible look. Delivers strong support with near-weightless comfort, ideal under tailored or fitted outfits.
• Classic Brief: A timeless cut with full coverage and natural adaptability. The everyday choice for men who prefer balance between heritage form and modern mobility.
• Trunk: A modern silhouette with a shorter inseam, combining a sculpted fit and enhanced mobility for active routines or casual wear.
• Boxer Brief: Our all-purpose fit with a longer inseam for balanced coverage and freedom. Engineered for daily wear and a wide range of body types.
• Long Boxer Brief: Extended coverage with secure, friction-free support. Designed for movement-intensive days or layering, ensuring comfort through endurance.

Every cut is crafted with precision to complement different lifestyles, ensuring performance that feels as natural as confidence itself.

To keep your UnderXLabs apparel, powered by AeroSkyn™, in top shape, follow these simple care tips:

• Standard Care: Machine wash on cold (30-40°C or 85-105°F) with a mild detergent. Use a gentle tumble dry on low heat for easy maintenance.
• Max Longevity: Hand wash gently in cold water (30-40°C) and air dry to preserve the fabric’s performance and fit over time.

Proper care ensures your UnderXLabs gear stays comfortable, supportive, and ready for every move.

UnderXLabs products are crafted in top-tier facilities across the globe, designed in the USA and brought to life through a trusted global supply chain. Our manufacturing partners in countries like China, Vietnam, and Bangladesh adhere to strict national regulations and align with our core values of quality, sustainability, and ethical production. We carefully select suppliers and materials to ensure every piece meets our high standards, delivering performance and responsibility in every stitch.

UnderXLabs redefines men’s underwear as performance-driven luxury with AeroSkyn™, a patented 85% nylon microfiber and 15% Lycra blend. Unlike budget brands’ short-staple cotton that tears or pills quickly, or mid-tier synthetics with outdated tech, AeroSkyn™ delivers grooved fibers for instant sweat-wicking, hollow-core insulation for all-day comfort, and antibacterial properties for lasting freshness. Seamless 3D knitting ensures a friction-free, second-skin fit, outlasting competitors’ basic designs. Our eco-friendly production guarantees sustainability and durability. Plus, our 30-Day Best Pair Guarantee—allowing returns or exchanges on one pair within 30 days, including shipping—make every purchase risk-free. This premium price reflects unmatched craftsmanship, innovative materials, and our confidence in delivering lasting value.

UnderXLabs is pleased to accept the following credit cards as convenient means of payment: American Express, Mastercard, Visa, JCB, and PayPal. In order to ensure that your shopping experience is simple and secure, order and payment transactions are processed using a secure server. Please note that the individual who submits the order must be the cardholder whose name appears on the credit card.

Most credit cards are declined because the billing address you entered does not match the address your bank has on file, incorrect CVV or wrong zip code. Please be sure to double check this info before proceeding. You can always try using a different type of payment like Paypal.

To check the status of your order, please visit the Thack Your Order page on our website.

If you purchased your order online while logged in, you may also see more information through your My UnderXLabs account.

Status updates regarding your order will be sent to your email; if you have not received these emails, please note that order confirmation emails may be caught in a spam or deleted folder; these emails usually do not appear in general email searches and may only appear when specifically searching your spam or deleted emails folders. We recommend searching these additional email sections with your order number to see if your emails may be in these folders.

Should you need to cancel or change your order, please Contact Us as soon as possible; we will make every effort to accommodate your request.

Please note that we cannot guarantee that your order may be adjusted once it has been submitted.

Shipped orders may not be cancelled or modified; however, you may return your item subject to our Terms of Use.

Please double-check the email address you used and spam folders. The confirmation may have gone to an email address you don’t frequently use. If you are still unable to find the order confirmation, it is likely the order did not go through.

We offer two convenient shipping options:

• Standard Shipping (3-5 business days)       £3.99
• Express Shipping (2-3 business days)        £6.99

Free shipping orders default to Standard Shipping. Delivery times are estimates and may vary due to unforeseen circumstances. Track your order anytime on our “Track Your Order” page.

Most orders ship within 1-2 business days. You’ll receive a Shipping Confirmation email once your order is on its way. If it hasn’t shipped after four business days, contact us at support@underxlabs.com.

All orders ship from our warehouse in Birmingham, United Kingdom. We currently don’t offer in-store pickups or in-person support, but our online experience is designed for ease and reliability.

Your UnderXLabs order arrives in our signature black package. For added protection, we use discreet, durable outer packaging to ensure your items arrive in pristine condition.

Order confirmations arrive within minutes, and shipping confirmations within 48 hours (weekend orders may ship Monday). If you don’t see them:

• Check your spam/junk folder.
• Verify you’re checking the correct email inbox.

Still missing? Contact us at support@underxlabs.com, and we’ll resolve it quickly.

If your order is incorrect, compare it to the shipping invoice in your package. For wrong items, missing items listed on the invoice, or someone else’s order, contact us at support@underxlabs.com, and we’ll make it right. If a missing item isn’t on the invoice, check your Shipping Confirmation email for a note about inventory issues—we’ll have refunded you automatically. We’re sorry for any mix-up and are here to help!

We offer a 30-day return policy. You have 30 days from delivery to request a return or exchange for one opened pair of AeroSkyn™ underwear. For first-time orders with multiple pairs, we recommend trying one pair to confirm sizing before opening others. Returns are processed within 48 hours of receipt and inspection. See our Return & Exchange Policy for full details.

To return or exchange your purchase:

1) Contact us at support@underxlabs.com for a return authorization number, which must be noted on the included return form.

2) Securely pack the item to prevent damage during transit.

3) Ship the package to our designated address via any courier, keeping tracking info for reference (a photo of the label works great).

Once received, items undergo quality inspection. Approved returns or exchanges are processed within 5-7 business days (longer during holidays). If an item doesn’t pass inspection, we’ll contact you with next steps. Visit our Return & Exchange Policy or Terms of Use for more info.

After receiving your return, we inspect it within 48 hours. Approved refunds or exchanges are fully processed in 5-7 business days, though holidays may extend this timeline. Check our Return & Exchange Policy or Terms of Use for details.

Customers are responsible for return shipping costs unless the return is due to our error (e.g., wrong or defective item). Contact us at support@underxlabs.com to initiate the process and confirm eligibility.