Underwear Fit, Size & Finder Help

Choosing underwear is personal: the right option depends on body shape, leg length, support preference, fabric and how you plan to wear it. For personalised suggestions, start with our Underwear Finder.

Quick style guide

• Trunks: fitted, shorter leg, modern everyday shape. Good under jeans, chinos, shorts and slim trousers.
• Boxer briefs: fitted with more thigh coverage. Good for longer days, movement, larger thighs and customers who prefer a longer leg.
• Briefs: fitted with no leg coverage. Good for support, warm weather and customers who dislike fabric on the thigh.
• Woven boxers: loose and relaxed, usually with a fly. Good for lounging, sleeping and customers who do not want a close fit.

If you are unsure of your size

Measure around the waist where your underwear waistband normally sits and compare that measurement with the individual product size information. Brand sizing can differ, and even two styles from the same brand can fit differently.

If you are between sizes, consider how you prefer the garment to feel: a smaller size may feel closer and more supportive, while a larger size may provide more room. Always prioritise the specific brand or product size guide.

Common fit problems

• Legs ride up: consider a longer boxer brief and check the leg opening and fabric stretch.
• Larger thighs: a longer boxer brief with good stretch can provide more coverage; woven boxers offer the roomiest fit.
• Too much fabric under slim trousers: try trunks or briefs.
• Want support without a long leg: choose trunks or briefs.
• Want more room at the front: look for contoured or engineered pouch designs.

Fabric guide

• Cotton stretch: familiar everyday softness with added flexibility and shape retention.
• Modal: smooth, soft and lightweight, often chosen for premium everyday comfort.
• Bamboo blends: typically soft and breathable; composition varies by product.
• Microfibre and performance fabrics: lightweight, quick-drying or moisture-managing options for active use, gym, travel or hot weather.
• Mesh: used on selected performance styles to increase airflow.

Support and pouch styles

Some underwear uses a contoured pouch for shaped support, while specialist pouch designs can provide additional separation or support. SAXX is particularly known for engineered pouch underwear, while selected Stance, Crossfly and other performance lines may also feature contoured or supportive constructions. Always check the exact product details.

Brand guidance

For classic cotton-stretch underwear, brands such as Calvin Klein, Emporio Armani, Tommy Hilfiger, BOSS, Lacoste, Björn Borg and Gant are useful places to start. For performance or specialist support, look at SAXX, Stance, PSD and other technical ranges depending on current stock.

More help

Use our Underwear Finder for personalised suggestions, our Underwear Fit Guide for style and size guidance, and our Underwear Buying Guide for fabrics and use cases.

Important: underwear cannot be returned, exchanged or refunded for an unsuitable size or fit once opened or tried on, so please choose carefully before ordering.