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© Byron's Britches
The foundation of a modern wardrobe. The Siberia Negro Short Boxer is the ultimate "daily driver." While bold colors have their place, every collection needs the timeless reliability of a solid black trunk. The "Siberia" line represents Mundo Único’s commitment to minimalist perfection—clean lines, a professional aesthetic, and the unparalleled comfort of the brand's anatomical engineering.

The Siberia Negro isn't just about the color; it's about the fit. It features the patented Copa Unico, a design specifically engineered for male wellness:
The Cool-Zone Advantage: By lifting and separating the anatomy from the thighs, the pouch promotes airflow and maintains a lower temperature, which is essential for intimate health and fertility.
Non-Stop Support: Whether you’re at the office or the gym, the pouch provides a secure, "locked-in" feel that eliminates the need for uncomfortable adjustments throughout the day.
Anti-Chafe Barrier: The structural design ensures zero skin-on-skin contact in sensitive areas, making it the perfect choice for long commutes or active lifestyles.
Mundo Único's "Siberia" series is designed for maximum durability and soft-touch comfort:
Premium Micro-Stretch Fabric: A high-grade blend that feels like a second skin. It is lightweight, breathable, and designed to move with your body without losing its shape.
The "Bóxer Corto" Cut: This trunk silhouette features a shorter leg length than standard boxer briefs, providing a streamlined look that stays hidden under tailored trousers and slim-fit denim.
Deep Pigment Tech: The "Negro" (Black) dye is formulated to resist the "fading to grey" effect, ensuring your underwear looks brand new even after dozens of washes.
Contoured Comfort Waistband: A wide, non-roll elastic band that sits comfortably at the hip, providing a secure fit that doesn't pinch or leave marks.

Brand: Mundo Unico USA
Style: Bóxer Corto (Short Boxer / Trunks)
Color: Siberia Negro (Solid Black)
Price: $23.80 (On sale from $34.00 – Save 30%!)
Available Sizes: S, M, L, and XL (Size XX currently sold out).
Shipping: Free Standard Shipping included.
Click the Shipping & Payments tab above the listing description for more info
Click the Shipping & Payments tab above the listing description for more info!
Additional delivery notesPICK UP OPTION
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Immediate payment is required upon selecting "Buy It Now" or upon checking out through the cart.
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The applicable amount of sales tax charged to an order will be calculated based on the shipment destination's state and local sales tax laws.
Thank you for shopping with us on eBay!
To contact our Customer Service Team, simply click the button here and our Customer Service team will be happy to assist.
© Byron's Britches
Click the Shipping & Payments tab above the listing description for more info
Accepted Payment Methods
Immediate payment is required upon selecting "Buy It Now" or upon checking out through the cart.
We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay.
We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus).
The applicable amount of sales tax charged to an order will be calculated based on the shipment destination's state and local sales tax laws.
Thank you for shopping with us on eBay!
Returns are accepted
Items must be returned within 30 days of the auction ending
Buyer will pay for return shipping.