Men's Boxer

The Mariner Underwear men's boxer collection is designed for everyday wear. You can choose from three fabrics: classic stretch cotton, certified organic cotton (sold in packs of two or three), and a cotton-bamboo blend, ideal for those who tend to run hot. All styles feature a boxer cut with a logo-branded jacquard waistband. They are available in sizes S to XXL and are machine washable at 30°C.

What's in the Men's Boxer Shorts Collection

Three fabric groups cover the range of men's underwear needs here.

Cotton stretch boxers are the everyday essential: 95% cotton, 5% elastane. The elastane keeps the fabric moving with you without going baggy. The knit waistband sits flat against the skin and doesn't dig in during a long day.

The organic cotton packs offer the same comfort thanks to certified organic fabric, 95% organic cotton and 5% elastane (jersey knit), and are sold in packs of two or three. An excellent choice if you want to know exactly what material is touching your skin.

The cotton-bamboo-elastane blend: Bamboo viscose is breathable and wicks moisture away from the skin. Low-rise cut with a wrap-style waistband. This is the ideal style for hot days or active commutes.

Cut and style: short boxers (brief style)

All boxers in this collection feature a short cut: they are fitted around the thighs and have shorter legs than standard boxer trunks. These are not loose-fitting boxers made of non-stretch fabric. Their stretchy, close-fitting design ensures comfortable support all day long, without bunching or uncomfortable riding up.

Available sizes: S to XXL. If you prefer a longer leg length, our range of men's boxer trunks offers a longer cut while maintaining the same stretchy materials and everyday comfort.

Fabric and Breathability

Cotton is the base across every style in the collection. Breathable, familiar, and well-suited to men's underwear worn all day. The elastane in each fabric gives stretch that pure cotton lacks on its own.

The bamboo boxer shorts add a softer hand feel. Bamboo viscose regulates temperature better than standard jersey and wicks moisture away from the skin. Men's bamboo underwear has grown popular for this reason: the fibre reduces odour-causing bacteria and sits lightly on skin, making it a comfortable everyday wear choice for men who run warm. The 43% bamboo content in Mariner Underwear's blend delivers these properties while keeping the structure that a pure-bamboo fabric sometimes lacks.

Colour Range and Style

The collection covers a wide design range. Neutral options include grey heathered, navy, and anthracite. Bolder choices include blue, indigo, turquoise, red, and orange. Most men stock a mix: neutral for everyday wear at work, a colour or two for everything else.

The brief-cut short is consistent across all fabrics. The waistband design differs: knit on the cotton styles, wrapped on the bamboo-cotton blend. Both sit low-profile under trousers or jeans.

Care Instructions

All men's boxer shorts in this collection are machine washable at 30 degrees. Low-temperature washing is right for all three fabric types. It keeps the elastane in good condition and is the proper care method for bamboo viscose.

Cotton and organic cotton options can be tumble-dried on low. The bamboo-cotton pair is better air-dried to preserve softness over repeat washes. Avoid bleach and fabric softener on all styles. Softener coats bamboo fibres and cuts the breathability that makes the fabric worth buying.

Size Guide

Mariner Underwear uses a standard S to XXL size range for all men's boxer shorts. Internal size codes run from 2 (S) to 6 (XXL). If you sit between two sizes, go up. The stretch fabric will accommodate, but going too small reduces the comfortable fit at the waist and thigh.

General waist guide: S = 28 to 30 inches, M = 32 to 34, L = 36 to 38, XL = 40 to 42, XXL = 44 to 46. Check the individual product page for precise measurements if you're on the border.

Boxer Shorts, Trunks or Briefs: Which Style to Wear

Men's boxer shorts (this collection) are a brief-cut short with minimal thigh coverage. Men's trunks underwear gives a longer leg and a more structured look. Classic briefs are the shortest style.

Choose boxer shorts for a relaxed feel at the thigh without excess fabric. They sit well under slim-fit trousers where a trunk leg might roll. Choose trunks if you want coverage that extends further down, or if you find brief-cut styles short during long days of wear.

For men who prefer natural materials throughout, the bamboo boxer shorts and the men's bamboo underwear range from Mariner Underwear share the same bamboo-cotton blend and are worth exploring together. Pairing bamboo boxer shorts with the wider bamboo range gives a consistent approach to everyday men's underwear without sacrificing comfort or breathability.

Frequently Asked Questions

What are men's boxer shorts made of at Mariner Underwear?

The collection offers three fabric options: 95% cotton with 5% elastane for the cotton stretch styles, 95% organic cotton with 5% elastane for the organic cotton packs, and a bamboo-cotton blend of 45% cotton, 43% bamboo viscose, 7% polyester, and 5% elastane. All are machine washable at 30 degrees.

Are these boxer shorts loose or fitted?

These are a brief-cut stretch short, not a traditional woven loose boxer. The fit is close through the thigh with a shorter leg, held in place by an elastane blend that moves with you throughout the day.

What sizes do men's boxer shorts come in?

Sizes run from S to XXL, using internal codes 2 to 6. As a general guide: S fits a 28 to 30 inch waist, M fits 32 to 34, L fits 36 to 38, XL fits 40 to 42, and XXL fits 44 to 46 inches.

How do I wash men's boxer shorts?

All styles in the collection are machine washable at 30 degrees. Cotton and organic cotton pairs can be tumble-dried on low. The bamboo-cotton blend is best air-dried to preserve its softness. Avoid fabric softener on any of them.

What's the difference between boxer shorts and trunks?

Boxer shorts in this collection are a brief-cut short with a shorter leg. Trunks have a longer leg and a more structured look. Both use the same stretch fabrics. The choice comes down to how much thigh coverage you want.

Do bamboo boxer shorts keep you cooler?

Yes. The bamboo viscose in the blend wicks moisture away from the skin and regulates temperature better than standard cotton jersey. If you run warm or commute in layers, the bamboo-cotton option is the one to go for.

Can I buy men's boxer shorts in a pack?

The organic cotton option is sold as a two or three-pack. Cotton stretch and bamboo-cotton blend styles are sold individually.