How Many Pairs of Underwear Do You Need? And When to Replace Them

Short answer: A sensible rule of thumb is 10 to 14 pairs of underwear: enough to change daily and still have room between wash days. Replace a pair when the elastic has gone slack, the fabric is thin, or the shape is gone. The number depends on how often you wash and on nothing else.

Count backwards from wash day

You need a clean pair for every day between two washes plus a buffer for the days when the wash gets postponed. If you wash once a week, that is seven pairs plus three or four. If you wash twice a week you can manage with fewer, but then you wash more often, and that wears them too.

Training and sport count separately

An item worn for training has to be washed the same day and cannot be worn again. If you train three times a week, add three pairs to whatever else you counted. If you use the same ones for everyday wear and training, you wear them out twice as fast and have to replace the whole drawer at once.

Buy several identical rather than many different

Buy several identical pairs at once and they wear in step, so you can replace them together when the time comes. You also avoid choosing in the morning. It is the same logic as with socks, and it applies just as much here. See the range under bamboo underwear for men.

How to see that a pair is worn out

Check three things. Whether the waistband has lost its tension and rolls down during the day. Whether the fabric has gone thin enough to see through against the light, usually at the crotch. And whether the shape is gone, so the item bags instead of lying close. Any one of the three is enough to discard the pair.

Do not wait for the hole

A hole arrives long after the item has stopped working. A slack waistband rolls down and creates folds, and a thin seat chafes. Both are discomforts you carry around every day without thinking about why. Check the drawer once a year and replacement becomes gradual rather than arriving all at once.

How long a pair should last

With washing at 30 to 40 degrees without fabric softener and without the dryer, a good quality pair should last several years. Tumble dried hot, the lifespan halves, because the heat damages the elastane in the waistband first and the rest afterwards. Washing matters more for lifespan than price does.

When the drawer needs renewing

Do not buy the whole drawer at once in a model you have not tried. Buy a single pair, wear it for a week, and then buy the rest if it works. It is the only way to avoid ending up with ten pairs that fit wrong, and it costs one extra week compared with ordering everything at once. See also washing guide and bamboo and your budget.