TANSTC Period Pants are reusable, high-waisted menstrual knickers sold on Amazon UK in a pack of three, aimed at heavy flow days, postpartum bleeding and light bladder leaks.
Prices checked on Amazon UK, 17 October 2026.
TANSTC Period Pants are reusable, high-waisted menstrual knickers sold on Amazon UK in a pack of three, aimed at heavy flow days, postpartum bleeding and light bladder leaks. They are made from 95% cotton and 5% elastane, with a four-layer leakproof gusset and full rear coverage. This review-style post covers this one product only and sticks to what the Amazon UK listing says, alongside NHS guidance on heavy periods, so you can decide whether they suit you before you buy. When we checked on 17 October 2026, the black three-pack in size L was £12.81 on Amazon UK (£4.27 per pair), in stock, sold by PULIOU TECHNOLOGY CO., LIMITED and dispatched from Amazon. Below you will find what is in the pack, how the layers work, how TANSTC says to wash them, who they suit, things to check before you buy, and answers to questions people search for about period pants. Prices change often and can vary by size, so check the live price before you buy.
Our picks
TANSTC Period Pants for Women
TANSTC Period Pants for Women
£12.81
Best overall
How we pick
We shortlist products sold on Amazon UK using capacity, features, customer ratings and price band. We do not lab-test every model unless a page says so. The Amazon page is the live price. How we recommend.
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The products
Buying advice
Our pick
Best overall: TANSTC Period Pants for Women, Heavy Flow Leakproof Menstrual Knickers (£12.81 for 3). A three-pack of high-waisted cotton period briefs with a four-layer gusset and wide coverage, designed to be washed and worn again. The price we saw was for the black pack in size L; other sizes and colours are listed separately on Amazon and may cost more or less.
What is in the pack
The Amazon UK listing gives a unit count of 3, so you get three pairs of briefs. The fabric is listed as 95% cotton and 5% elastane, with a 100% cotton gusset. The rise is high, the fit is regular with medium stretch, and the fabric weight is described as lightweight. The country of origin is China.
How the four layers work
TANSTC says the crotch has four layers: a 100% cotton layer next to the skin, an absorbent second layer, a waterproof third layer and a breathable cotton outer layer. The briefs have wide protective coverage, including full rear coverage, which the brand says helps avoid stains on sheets and clothes and can also hold a pad in place.
What the Amazon UK listing says
Heavy flow: the listing describes a leakproof design for heavy flow, but TANSTC itself recommends wearing the pants with other sanitary products, such as a pad, tampon or cup, on heavy days, and wearing them alone only for light flow or the end of your period.
High waist: soft and stretchy, which TANSTC says helps stop them riding up or rolling down, and may help slightly with bloating.
Postpartum and light incontinence: the brand suggests them as postpartum underwear, including after a C-section, and for small leaks when you cough, laugh or sneeze.
Certification: the listing shows a sustainability badge saying the product is made with safer chemicals, as certified by OEKO-TEX STANDARD 100.
Washing: machine washable below 40°C. TANSTC adds that hand washing and air drying is better for keeping the leakproof layer working at its best.
Who they suit
These suit anyone who wants a reusable back-up layer under a pad, tampon or cup on heavy days, or reusable protection on its own on lighter days. The high waist and full coverage are aimed at comfort and at catching leaks overnight, and the brand also pitches them for after giving birth.
What the NHS says about heavy periods
The NHS says heavy periods can be normal for you, but lists signs such as needing to change a pad or tampon every 1 to 2 hours, needing to use 2 types of period product together, periods lasting more than 7 days, passing clots larger than about 2.5cm, or bleeding through to clothes or bedding. See a GP if heavy periods are affecting your life, you have had them for some time, you have severe period pain, or you bleed between periods or after sex. Treatment can help.
Things to check before you buy
Size: check the size chart on the Amazon page for your size; prices and stock vary by size and colour.
Heavy days: follow TANSTC's own advice and pair them with another product on your heaviest days.
Postpartum: if you have heavy bleeding after giving birth, follow your midwife's or GP's advice.
Prices note
The £12.81 price above is the Amazon UK buy-box price we saw on 17 October 2026 for the black three-pack in size L. Amazon prices change often, so use the See price on Amazon button to check the current price and availability before you buy.
Frequently asked questions
How do period pants work?
Period pants have extra layers in the gusset to catch blood. TANSTC says its briefs use four layers: cotton next to the skin, an absorbent layer, a waterproof layer and a breathable cotton outer layer. You wear them like normal knickers, then wash and reuse them.
How do you wash period pants?
TANSTC says its period pants are machine washable below 40°C, and that hand washing and air drying is better for keeping the leakproof layer working well. Always check the care label that comes with your pair.
Can you wear period pants without a pad?
TANSTC recommends wearing its period pants on their own only for light flow or the end of your period, and with another product such as a pad, tampon or cup on heavy days to catch any leaks.
Can you sleep in period pants?
Yes, many people wear them overnight. TANSTC says the wide, full rear coverage is designed to help avoid stains on sheets, and the high waist can hold a pad in place. On heavy nights, follow the brand's advice to use them with another period product.
Can period pants be used for incontinence?
TANSTC says these briefs can catch small accidents from light incontinence, such as when you cough, laugh or sneeze. They are not sold as incontinence products, so if you have regular or heavier bladder leaks, speak to a GP or pharmacist about the right products and support.
Can period pants be tumble dried?
TANSTC does not mention tumble drying. It says air drying is better for keeping the leakproof layer working at its best, so it is safest to air dry them.
