How to Care for Your Period Underwear to Make It Last

Quick answer

Rinse period underwear in cold water as soon as you take it off, then wash it gently, by hand or on a cold delicate machine cycle with mild detergent. Skip fabric softener, bleach, and heat, and always air dry. That routine keeps the absorbent layers working and helps you extend the life of period underwear for years, not months.

Period underwear is an investment, and the way you wash it decides how long it keeps working. Heat, harsh chemicals, and long soaks break down the absorbent layers and stretch the fabric, which is why a five-minute routine after each wear matters more than any special product.

This guide walks through the full cycle, from the moment you take a pair off to how you store it between periods. It applies whether you wear a Period Midi Brief - Beige on a medium-flow day or an Adult Active Crop - Black for training, because the care rules are the same across the range.

Why period underwear care is different from regular laundry

Period underwear is built from layers that do different jobs: a soft top layer against your skin, absorbent layers in the middle, and a leak-resistant layer at the back. Detergent residue, fabric softener, and heat can coat or compress those layers, so they stop absorbing as quickly or start holding onto odour.

That is why the label rules are stricter than for ordinary knickers. Cold water protects the fibres, mild detergent rinses clean, and air drying keeps the shape and stretch intact. Follow those three rules and most pairs will outlast the cycle of replacing them every few months.

• Never use fabric softener or dryer sheets; they leave a waxy film on absorbent fabric.
• Skip bleach and enzyme-heavy stain removers unless the care label specifically allows them.
• Wash period underwear separately from heavy items like jeans or towels to reduce abrasion.

How to wash period underwear step by step

Start with a cold rinse. Hold the gusset under cold running water until the water runs mostly clear, which removes the bulk of the flow before it sets. If you cannot rinse straight away, fold the pair and place it in a washbag or a sealed container until you get home, rather than letting it sit damp in a laundry basket.

For hand washing, fill a basin with cold water and a small amount of mild detergent, gently squeeze the water through the fabric, then rinse until no suds remain. For machine washing, use a cold, gentle or delicate cycle with a low spin, and put the underwear in a mesh washbag to stop it stretching or snagging.

• Wash within 24 hours of wearing where possible; the longer blood sits, the harder it is to rinse out.
• Use roughly half the detergent you would for a normal load, since residue is the main cause of lingering odour.
• If you use a machine, choose a cycle under 30°C and avoid long soaks.

Drying and storing period underwear

Air drying is the single biggest thing you can do to extend the life of period underwear. Hang or lay pairs flat in a well-ventilated spot, ideally out of direct harsh sun, until the gusset is completely dry, which can take longer than the outer fabric suggests. If the middle still feels cool or damp, give it more time.

Once dry, store period underwear loosely folded in a drawer, separate from anything with hooks or zips that could snag the fabric. Keep a small washbag with your period supplies so used pairs have somewhere to go when you are out, and rotate between several pairs so each one gets proper rest between wears.

• Never tumble dry period underwear; heat is the fastest way to destroy absorbency and elasticity.
• If you must speed things up, use a fan or a cool setting on a hair dryer, not a radiator.
• Keep at least three to four pairs in rotation so you are never forced to wash one before it is ready.

Common mistakes that shorten the life of period underwear

The most common mistake is treating period underwear like a towel: hot wash, big detergent dose, tumble dry. Each of those steps individually causes damage, and together they can break down the absorbent layers within a few months. Another frequent error is leaving a pair to soak overnight, which lets odour set into the fabric.

A less obvious mistake is over-washing. If a pair was worn on a light day and is not heavily soiled, a cold rinse and a quick hand wash is often enough, which reduces wear on the fibres. Check the care label on each pair, since fabrics differ across the range, and follow it over any general rule.

• Do not wring or twist period underwear to remove water; press it between a towel instead.
• Avoid washing with towels or heavy knits that shed lint into the absorbent layers.
• If odour lingers after washing, re-rinse in cold water rather than reaching for bleach.

Your five-step period underwear care routine

1. Step 1: Rinse in cold water immediately: Hold the gusset under cold running water until it runs mostly clear. If you are out, seal the pair in a washbag until you get home. Checkpoint: no hot water at any stage, including the first rinse.
2. Step 2: Wash gently with mild detergent: Hand wash in cold water, or machine wash on a cold delicate cycle in a mesh bag with about half the usual detergent. Mistake to avoid: pouring detergent directly onto the gusset, which can leave residue.
3. Step 3: Rinse until the water runs clear: Squeeze, do not wring, and rinse until no suds remain. Residue is the main cause of lingering odour. Checkpoint: if the water still foams, keep rinsing.
4. Step 4: Air dry completely: Lay flat or hang in a ventilated spot away from direct harsh sun. Give the gusset extra time, since it dries slower than the outer fabric. Mistake to avoid: tumble drying, which breaks down absorbency and stretch.
5. Step 5: Store loosely and rotate your pairs: Fold loosely in a drawer away from zips and hooks, and keep three to four pairs in rotation so each one rests between wears. Next step: keep a small washbag with your period kit for used pairs when you are out.

Care notes from the Love Luna range

• Period Midi Brief - Beige: Designed to sit a little higher on the waist and a little lower on the legs for a snug fit, in sleek microfibre, with medium flow absorbency of 10-15ml (2-3 regular tampons). Microfibre responds well to cold hand washing and air drying, and the higher waistband keeps its shape better when you avoid hot water and tumble drying.
• Side Seamfree Bamboo Period Full Brief - Black: Made with seamless knitting technology and soft, breathable viscose from bamboo, with elastic binding at the leg openings to stop the briefs riding up. Seamfree bamboo styles are prone to snagging, so a mesh washbag and air drying protect both the smooth finish and the leg binding.
• Adult Active Crop - Black: Made from super stretch recycled polyester for active use, designed to handle periods during gym classes, training, and sports. Sweat plus period flow means this piece needs a cold rinse soon after use; heat and softener would reduce both the stretch and the absorbency you rely on during training.

Cold rinse, gentle wash, air dry, repeat. That routine takes a few minutes per pair and is the difference between replacing period underwear every season and getting years of reliable use from it.