Men's Underwear Australia: MicroModal Trunks and Boxer Briefs by Debriefs

Trunks have a shorter inseam that sits mid-thigh, while boxer briefs extend further down the leg for more thigh coverage. Both styles use the same MicroModal fabric and construction.

Choose trunks if you prefer less leg coverage and a lighter feel. Choose boxer briefs if you want extra coverage to prevent thigh chafing, especially during physical activity. Read our full comparison.

No, it's a fly opening. We've bucked the trend and designed a fly in a horizontal layout because it's much more practical than a vertical fly. It gives you quicker, easier access when nature calls and eliminates the fumble you'd get with traditional fly designs.

Once you try it, you'll wonder how you ever managed without it.

Debriefs are made from 94% MicroModal and 6% Elastane. MicroModal is a premium fabric derived from sustainably managed European beechwood, produced by Lenzing in Austria. It's 3x softer than cotton, naturally breathable, and moisture-wicking. The 6% Elastane provides 4-way stretch for a supportive fit that doesn't lose its shape. See how MicroModal compares to cotton and bamboo.

Debriefs underwear is made in Turkey by a GOTS-certified manufacturer that runs on solar power and plants 1,000 trees annually. The MicroModal fabric is sourced from Lenzing in Austria, where it’s produced from FSC-certified beechwood using a closed-loop process that recovers 99% of resources. Learn more about our supply chain.

MicroModal is one of the most eco-friendly fabrics in the textile industry. It’s 100% biodegradable, derived from renewable beechwood, and produced using 20x less water than cotton. Our manufacturing partners are GOTS-certified and follow sustainable production practices. We also use 100% biodegradable mailing satchels and carbon-neutral shipping providers. See our full sustainability commitment.

It's easy! Simply add all the items you want to your cart and a discount will be applied automatically. The more you add, the higher the discount will be.

You can mix any style, colour and size.

Nothing. The price will work out the same. You just have the option to create your own multipack with any style, colour and size combination, or select a pre-made one.

Prefer to spread the cost? Our monthly subscription delivers a fresh pair every month at 22% off.

Orders are processed within 1-2 business from confirmation. Australian orders are shipped via Couriers Please or Australia Post depending on your location.

Estimated delivery time is 1-3 business days for metro areas, and 2-6 business days for rural areas.

All international orders are shipped via Australia Post and are estimated to arrive within 3-10 business days.

Tracking information is provided for all orders upon shipment.

Express shipping is available for all orders at an additional fee.

All orders are shipped from Sydney, Australia.

Yes, we ship worldwide from our warehouse in Sydney, Australia. Free shipping is available on international orders over 150 in local currency.

We accept returns within 30 days of delivery if they are unworn, unwashed, and in their original packaging. You can exchange your items for a different pair, or request a full refund of the purchase price.

To submit a return, please visit the returns page.

If you're not satisfied with your first pair of Debriefs and it's within 30 days of receiving them, you can request a refund from the returns page here.

Refunds are only eligible on first time purchases, and are limited to 1 pair.

Every pair of Debriefs comes with a 52-wash guarantee. If your underwear develops holes, tears, or waistband failure within 52 washes, we'll replace them free of charge.

The guarantee covers manufacturing defects and fabric integrity issues, not damage from improper care or general wear and tear. Limited to 2 pairs per order.