Men's Bamboo Trunks - Lunar

¥2,800

Size:

S M L XL

Variant

Soft grey with space to move—our Lunar Trunk blends timeless minimalism with all-day comfort. Crafted from breathable bamboo fabric, it’s built to feel weightless yet supportive, whether you're working, lounging, or heading out. Expect a smooth fit, no irritation, and a subtle style that keeps things cool and low-key.

• Sustainable bamboo fabric – Silky-soft, breathable, and eco-friendly
• Light grey tone – Understated and easy to wear
• All-day support – Contoured pouch and flexible waistband
• Breathable and moisture-wicking – Helps regulate temperature
• Stitched-in labels—designed to eliminate irritation.
• Lasting quality – Holds its shape and softness after every wash

Note: Our trunks have a 4.5-inch inseam (11.5 cm) and may also be referred to as ‘boxer briefs’ in some regions.

SIZE CHART

View Size Chart Here.

DELIVERY & RETURN

Not 100% happy? Return full-price items (unused, in original packaging) within 30 days for a refund or exchange. Exclusions apply (sale items, underwear, socks, etc.).

Return shipping is the customer’s responsibility.
View full policy here.

CARE INSTRUCTIONS

To keep your Mosmann bamboo underwear soft, fresh, and long-lasting:

Cold gentle machine wash with like colours
Use mild detergent – avoid bleach or fabric softeners
Line dry in shade – avoid direct sunlight to maintain fabric integrity
Do not tumble dry – heat can damage the fibres
Do not iron – bamboo fabric is naturally smooth
Do not dry clean

FABRIC COMPOSITION

95% Bamboo, 5% Elastane

SKU: TR048-S

First Pair Promise

Trying Mosmann for the first time? If you’re not satisfied with your first pair, you may request a refund for one pair of underwear from your order. Applies to underwear only.

Men's Bamboo Trunks - Lunar

¥2,800

Get Comfortable

Style, Comfort & Sustainability

Create unforgettable summer moments with matching father and son swim shorts from Mosmann Australia. Designed for dads and boys who like their style effortless and refined, our coordinated swim shorts combine premium fabrics, tailored comfort, and timeless prints inspired by coastal living. Whether you’re beachside, poolside, or on holiday, Mosmann’s matching swimwear delivers a confident fit, quick-dry performance, and all-day comfort — so you can focus on making memories together. Perfect for family holidays, special occasions, and sun-soaked adventures.

Matching Swim Shorts

Mens Bamboo Underwear

Welcome to our online store featuring the latest in sustainable and stylish underwear - made from bamboo!
Our underwear is designed in Sydney Australia to provide you with ultimate comfort with playful designs that will make you smile. Available in briefs, boxers, trunks and jockstraps we use only the finest materials and manufacturing techniques that are long-lasting and durable.

Choosing bamboo underwear means you're making a conscious effort to reduce your environmental impact. We take pride in designing high-quality underwear that will last! . Find the perfect underwear to match your unique style. Whether you're looking for a bold print or a classic solid colour, we've got you covered. Shop now and experience the comfort and style of bamboo underwear today!

Mens Board Shorts

Looking for the perfect swim shorts that seamlessly transition from the beach to the bar?
Look no further than our collection of men's stretch swim shorts! Crafted with quick-dry, stretchy fabric, these swim shorts offer the perfect combination of comfort and functionality. Whether you're swimming, surfing, or just lounging in the sun, these shorts will move with you and keep you feeling comfortable all day long.

Our swim shorts are designed in Sydney, Australia, with a focus on style and functionality.
The perfect length ensures that they are versatile and suitable for any occasion, whether you're hanging out by the pool or heading out for a night on the town. But that's not all! Our swim shorts also feature a soft mesh lining that adds an extra layer of comfort and support. And with their versatile design, they are perfect for any summer adventure. So why wait? Whether you're planning a trip to the beach or just looking for a comfortable and stylish pair of swim shorts, our men's stretch swim shorts are the perfect choice. Shop our collection today and experience the perfect combination of style, comfort, and functionality!

Boys Board Shorts

Shop swim shorts for your active little guy.
Look no further than our collection of boys swim shorts with fun designs he’ll love! With a zipper back pocket, mesh lining, 4-way stretch fabric, and quick-drying capabilities, these swim shorts are the perfect choice for any water activity.

Our boys swim shorts are designed with both style and functionality in mind. Mosmann Australia designs are sure to make a splash at the pool or beach, while the zipper back pocket allows for easy storage of small items like sunglasses or sunscreen. The mesh lining ensures a comfortable fit, while the stretch fabric provides a full range of motion for active boys.

But that's not all - our boys swim shorts also come in matching prints with our men's swim shorts, perfect for father & sons, uncle and nephews! So why not make it a family affair and coordinate your swimwear for your next beach vacation or pool day? Our matching prints are the perfect way to show off your family's fun and playful spirit. Don't settle for boring swim shorts for your little guy. Choose Mosmann Australia’s boys swim shorts. Don't forget to check out our matching prints for men and fathers, too!

Customer Reviews

Real feedback from real customers

Long Time Customer

I have been buying from the Mosmann people for years now. They sell good quality underwear and with the worldwide free shipping option. It is just like buying locally or even cheaper ( I live in Hungary). They have great multipack special offers, cool designs and if there is a problem or issue their customer service is quick to respond and help. Recommended.

Zoltan Kisjuhasz

Large is actually large!

I've bought, from other makers, underwear labelled X-large that were actually medium 🙁 Mosmann fits perfect, fabric is soft & range of patterns is fun.

Duncan Armstrong

Best Swim Shorts

Mosmann men’s swim shorts are an absolute godsend! They’re super comfy. - I don’t just wear mine in the water, I wear them when ever I want a bloody comfy pair of shorts. They dry quickly, which is a bonus especially come spring and summer here in Australia. I bought my first pair around 12 months ago and I now own 5...I’m loving the product and designs. I highly recommend them to all guys who want amazing pair of shorts that fit flawlessly and make you look amazing, they hug the but too...ladies

20connor

Perfect for Vacay

Just back from Bali and basically didn't take my Mosmann's off for 3 weeks. Brilliant in the pool, on the beach and everything in between! Another RIPPER Aussie brand

Craig Mcleod

Excellent Service

hey enabled me to swap a pair of swim shorts at last minute before dispatch and also waved the price difference .
Not many retailers would do this , thanks a million Mosmann

Tony Howden

Free delivery worldwide

For orders above 69USD (100AUD)

Satisfied or refunded

Easy 30 Days return on outerwear (Excludes Underwear)

Customer Satisfaction

4.8 Star Customer Reviews

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