Boxer shorts or trunks
Short answer: Boxer shorts give you air and freedom of movement, while trunks fit close and stay put all day. Choose according to the trousers you wear and how much you move about.
The real difference is air versus support
Boxer shorts are loose in cut and often have legs that reach down the thigh. Trunks are short, close fitting and knitted from a stretchy fabric, so they sit almost like a second skin. It is not a question of better or worse, but of whether you put air or support first. The loose cut lets air move around, and the close one keeps everything in place when you walk, run or sit in the car.
When boxer shorts are the better choice
Boxer shorts suit warm days, days at home and the night, when you do not want to feel anything at all. They also work well under wide trousers, because nothing pinches or shows through. The drawback is that the legs can ride up or bunch together if your trousers are slim. If you often have to tug at the fabric in the middle of the day, boxer shorts are probably not the right choice for that particular outfit.
When trunks do better
Trunks are the obvious pick under slim trousers, jeans and sportswear, because they do not creep up and do not form folds under the outer fabric. For cycling, long walks and a busy day on the move, the short, close fit is an advantage. Mind the size, because trunks that are too small can chafe at the groin, and ones that are too big will slip and wrinkle. The waistband should hold firmly without cutting in, and the leg opening should lie flat.
The fabric matters as much as the cut
Whatever the cut, the fabric decides the comfort. Viscose from bamboo feels soft and smooth against the skin, has a cool touch and absorbs moisture, so you feel dry for longer. A little elastane in the blend keeps the shape, so the waistband does not tire after a few washes. See bamboo underpants for men if you would like to compare cuts and fit side by side in the same material.
For everyday, travel and night
For the office day in chinos or a suit, both types work, but trunks lie flatter under thin cloth. When travelling, trunks are practical because they take up little room and dry quickly after a wash in the sink. At night, boxer shorts are often more comfortable, especially with a loose T-shirt. See night T-shirt for men, and get an overview of the whole range under bamboo underwear for men.
Our recommendation by situation
If you wear slim trousers, cycle or walk a lot, choose trunks. If you mostly sit still, stay at home, sleep or wear wide trousers, choose boxer shorts. Most men benefit from keeping both in the drawer and picking according to the clothes and activity of the day. Wash at 30 to 40 degrees, avoid fabric softener and a hot tumble dryer, so that waistband and fabric keep their shape for longer.
Frequently asked questions
Are trunks warmer than boxer shorts
Often a little, because they fit close and trap less air. In a soft, breathable material most people hardly notice the difference in daily life.
Can I wear boxer shorts under jeans
Yes, but they can ride up and bunch together around the leg and crotch. Choose a shorter leg, or switch to trunks if it bothers you.
How do I find the right size
The waistband should sit firmly without leaving deep marks, and the leg opening should lie flat without cutting in. If you are between two sizes, try the larger in a loose style and the smaller in a close fitting one.
