Protect your crown jewels without sacrificing comfort.

Experience the unmatched softness and performance of Royal Alpaca fiber.

Shop The Royal Boxer

Temperature Regulating

Naturally Odor Resistant

Ultra-Soft Comfort

Durable Everyday Wear

THE ALTI DIFFERENCE:
ROYAL ALPACA.

Sourced from the high Andes, our Royal Alpaca is finer than Cashmere. This ultra fine fiber responds to temperature changes—expanding to cool, contracting to insulate. It's not just soft. It's biological engineering, perfected over 6,000 years.

Why Alpaca?

Engineered For What Matters Most

  • 1. The Royal Sanctuary

    A pure Royal Alpaca interior creates a naturally soft, non-toxic contact layer designed for comfort in the most sensitive areas.

  • 2. Thermal Bio-Core

    A structured alpaca–cotton blend adapts to body temperature while maintaining breathability, shape, and long-term durability.

  • 3. Architectural Interface

    A brushed, zero-roll waistband provides secure hold without compression, pressure points, or distraction.

The Royal Boxer Brief

$64.00 $54.00
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Select Color
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Estimated delivery between January 29 and February 02. Order within .

The Royal Brief is engineered where it matters most — using the world’s most sophisticated natural fiber.

Born on the Peruvian Altiplano at 4,000 meters above sea level, Royal Alpaca evolved over thousands of years to adapt to extreme temperature swings. Its hollow-core fibers naturally regulate heat, manage moisture, and stay soft against skin. We apply this evolutionary advantage where comfort matters most, then balance it with breathable organic cotton, TENCEL™ Lyocell, and a fabric-encased waistband for all-day support.

Sourced and crafted entirely in Peru, The Royal Brief is designed for men who expect more from what they wear every day — without plastic, gimmicks, or shortcuts.

On skin: Royal Alpaca–powered comfort where it matters most. The Sanctuary Pouch™ combines ultra-fine alpaca fibers with organic cotton and silk for a surface that stays soft, dry, and irritation-free. The fabric-encased waistband sits comfortably without itching, pinching, or rolling.

On the move: A naturally flexible knit moves with you through long days, travel, and light training — maintaining its shape without relying on plastic stretch fibers. Breathable, supportive, and comfortable from morning to night.

Choosing your size: Designed for a true-to-size fit. If you prefer a slightly more relaxed feel or are between sizes, we recommend sizing up.

Details

  • 5.3" inseam — balanced everyday length
  • Sanctuary Pouch™ — targeted support and thermoregulation
  • Fabric-encased waistband — no exposed elastane against skin
  • No-roll construction — stays flat and comfortable
  • Vertical fly — functional, minimal, no excess bulk
  • Tagless interior — nothing to scratch or distract
  • Made in Peru

Sanctuary Pouch™

Royal Alpaca · 100% Organic Cotton · Silk

The most sensitive area deserves the most advanced natural fibers.

Royal Alpaca provides natural thermoregulation and odor resistance, organic cotton adds structure and durability, and a touch of silk reduces friction for all-day comfort.

Why it matters

  • Naturally temperature-regulating
  • Soft, dry, and irritation-free
  • Hypoallergenic and odor-resistant

Main Body Fabric

Organic Cotton · TENCEL™ Lyocell

A breathable, lightweight knit designed for daily wear. Organic cotton delivers durability and a familiar softness, while TENCEL™ Lyocell improves moisture management and long-term shape retention — without relying on plastic stretch fibers.

Why it matters

  • Breathable and moisture-wicking
  • Soft against skin
  • Durable through repeated washes

Waistband

Fabric-Encased Natural Rubber

A supportive waistband that stays comfortable all day. Natural rubber provides stretch and recovery, fully wrapped in soft fabric so no elastic or synthetics touch your skin.

Why it matters

  • Secure fit without digging
  • No exposed elastane
  • Comfortable for all-day wear

Lining & Trim

Organic Cotton

Soft, durable finishes where it counts — chosen for comfort, breathability, and longevity.

At a Glance

  • No plastic against skin
  • Naturally breathable and thermoregulating
  • Designed for male anatomy
  • Crafted for daily comfort and durability

Dyes: Non-toxic and OEKO-TEX® certified — safe for your skin and everything below the belt.

Care: Cold wash, tumble dry low. Shrinkage is normal — size up for the perfect post-wash fit.

SHIPPING
Please allow 1-2 business days for order processing. The cut off time for expedited order is 12pm EST which means orders after that time will go out the next business day. We will email you when the order is shipped. Please check junk/spam if you do not receive it in your inbox.

If you purchased shipping protection from Alti and have a lost, damaged, missing, or stolen package, email us to file a claim.

US SHIPPING RATES
All US orders are shipped via UPS/USPS and should be received within 3-6 business days after processing. Delivery time do not include Saturdays, Sundays or holidays. Shipping rates are calculated by USPS for all orders up to $150. Orders $150+ are eligible for Free Shipping.

We have a 90-day return policy, which means you have 90 days after receiving your item to request a return.

If you’re not satisfied with the fit of your Alti, we offer a 90-day refund guarantee. Here’s how it works:

Only open and try on one pair if you’ve ordered multiple.
Example: If you order an 8-pack, open and try on just one pair. If the fit isn’t right, Return all 8 pairs for a full refund. Make sure the opened pairs are easily recognized as the open ones. (Processing and handling fees may apply)

*We do NOT provide refunds for single pair orders that have been worn or washed.

Note: All shipping costs, duties/import taxes and any other associated fees such as exchange and transaction fees are non-refundable

Why Switch to Alti?

The Royal Boxer Brief
Organic Cotton
Traditional (Spandex/Polyester)
GOTS Certified organic cotton
No harsh chemicals
Protects from microplastics
Superior temperature regulation

Hear from Alti customers

James R.
Age: 34

Finally, underwear I don’t think about

I was skeptical at first, but these disappear once you put them on — in the best way. No overheating, no bunching, no adjusting throughout the day. They just work. I’ve slowly started replacing my other pairs with these.

#obsidian_single

The Royal Boxer Brief

$64.00 From $54.00

Michael T.

Age: 41

Noticeably different fabric

The feel is immediately different from cotton or synthetic underwear. It stays dry and comfortable even after long workdays. The pouch design is subtle but effective — supportive without feeling engineered or awkward.

#obsidian_single

The Royal Boxer Brief

$64.00 From $54.00

Daniel S.
Age: 29

Noticeably different fabricaWorth the upgrade

I usually wouldn’t spend this much on underwear, but I get it now. The fabric is incredibly soft and breathable, and they still feel new after multiple washes. These have become my everyday go-to.

#obsidian_single

The Royal Boxer Brief

$64.00 From $54.00

SUSTAINABLY SOURCED.
ETHICALLY CRAFTED.


Free roaming alpacas is free-reaming mammals, but shamastentral handimanes, so tee our sortiveroeek to or antioh our fair trade and our almost and environmental stewardship.