Men's Underwear

The main difference is leg length. Debriefs trunks have a 5 cm inseam and less thigh coverage. Debriefs boxer briefs have a 9 cm inseam and cover more of the inner thigh. Both use the same MicroModal blend, horizontal fly, contoured pouch, flat-lock seams and no-roll waistband. See the full trunks versus boxer briefs guide.

Choose trunks if you prefer a shorter leg and less fabric under fitted clothes. Choose boxer briefs if you want more thigh coverage, your thighs rub, or you need underwear for active days. If you like both fits, you can mix the two styles when building a multipack. You can also take the Debriefs fit quiz for a personalised recommendation.

Debriefs underwear is designed to stay in place without riding up or bunching. The trunks use a short square-cut leg and reinforced hem, while the boxer briefs use a longer 9 cm leg that grips below the widest part of the thigh. Choosing the right size and style gives the design the best chance to sit as intended.

Yes. Debriefs uses lightweight, breathable MicroModal that absorbs and releases moisture to help keep the skin drier. That makes both styles well suited to hot Australian weather and men who tend to sweat. Boxer briefs add thigh coverage for rubbing, while trunks use less leg fabric. See our breathable underwear fabric guide.

A horizontal fly is an opening that runs across the front of the underwear instead of vertically down it. Debriefs' fly gives access from above while the contoured pouch stays supportive around it. The design works for left-handed and right-handed wearers. Our horizontal fly guide shows how it works.

Measure your waist and match it to the Debriefs size chart. Use the measurement rather than relying only on the size printed on another brand. If your waist falls between two Debriefs sizes, choose the larger size. The correct size should feel close and supportive without digging into the waist or thighs. You can also take the Debriefs fit quiz for a personalised recommendation.

Debriefs multipacks let you buy several pairs together at a lower per-pair price. You can choose a ready-made pack or build your own by adding individual pairs to your cart. The same quantity discount applies either way, and build-your-own discounts are added automatically. The current multipack options and prices are shown in the multipack collection.

Free shipping on 3+ pairs.

Standard shipping is $6.95 for orders below three pairs.

Debriefs accepts eligible returns within 30 days of delivery. Ordinary returns must be unworn, unopened and still in their original packaging. Return shipping is free for eligible returns from Australia and New Zealand. Customers in other countries may still return eligible items, but there may be return shipping costs. Because underwear is a hygiene-sensitive product, any item that is clearly opened and returned as an ordinary return is ineligible for a refund or exchange and will be returned to the customer at their own expense. The separate First Pair Guarantee covers one worn pair from an eligible first order under its own conditions. Read the returns page before submitting a request.

The Debriefs First Pair Guarantee covers one worn pair from a customer's first eligible purchase, including a multipack. Sale items and subscriptions are not eligible. A request must be made within 30 days of delivery, and the pair does not need to be returned. You can choose either a refund or a replacement pair, but not both, and original shipping costs are not refunded. The guarantee is non-transferable and cannot be combined with a normal return or exchange. Submit a request through the returns page.

The Debriefs 52-wash guarantee covers defects in the fabric or waistband within 52 washes or 12 months. Covered examples include holes, tears, loose stitching and loss of waistband elasticity. Approved claims receive a replacement, subject to the full terms and a maximum of two pairs per customer in any 12-month period.