top of page
15% off all teen products until 30 September 2026 · Applied automatically at checkout

Prepared. Comfortable. Confident

Teen Period Underwear for School, Swimming and Sleep

Help them feel prepared for first periods, school days, heavy-flow nights, sports and swimming with soft, reusable protection designed for growing confidence.

Liberty underwear teens celebrating

UK laboratory tested

Fast Jersey & UK delivery

Free UK delivery over £60

Personal sizing help

Shop by need

First periods

Four pairs, a waterproof bag and a supportive guide.​

Shop First Period Kit

School days

Comfortable heavy-flow and medium- flow protection for school days.

Shop School-Day Pants

Nights & sleepovers

Three pairs with extended protection to the back waistband for sleep.​

Night Protection

Swimming

Reusable swimsuits and bikini pants for lessons and holidays.

Shop Teen Swimwear

“After trying several brands, Liberty was the first that felt comfortable and discreet enough to give my daughter confidence.”

Verified Liberty parent

Find the right protection

Product type
Best for
Why choose it
First period kit
Mix of 3 heavy flow + Bikini + Water proof bag
Gives you the best complete starter pack
Period sleep pack
Heavy-flow nights, sleepovers and trips away
Absorbs up to 35ml with soft, breathable four-layer protection from front to back waistband.
Period swimming costume
Swimming lessons, training and water activities
Absorbs up to 15ml with a slim, quick-drying lining that won’t swell in water. Wear without tampons, pads or cups.
Period swimming bikini
Holidays, swimming training, swimming competitions worn under skins, beach days and casual swimming
Absorbs up to 15ml with discreet, quick-drying front-to-back protection. Wear alone and pair with your favourite bikini top.
Medium flow period pants
Medium or lighter days and everyday wear
Absorb up to 25ml with a smooth, seamless high-waist fit. Comfortable, breathable and discreet under school uniforms and everyday clothes.
Heavy flow period pants
Heavy flow days (e.g first day), school day, exercise, dance, longer wear, night wear
Absorb up to 35ml with moisture-wicking, extended back protection. Soft, stretchy and discreet—wear alone without pads or tampons.

All styles are machine washable and reusable, helping teens feel prepared while reducing reliance on disposable period products.

Teen period protection

    Independently tested for safety

    Shirley Technologies tested Liberty’s submitted outer fabric and inner gusset. Results apply to the garment sections identified in report 83780.

     No detectable silver in the tested sections

    No detectable formaldehyde in the tested sections

    Measured pH: outer 5.5 · inner gusset 5.7

    First period kit review
    00:19
    Editah swimming costume review
    00:35
    Beth Review
    00:35

    Hear from our customers

    Get the fit right

    Measure the waist and fullest part of the hips, then compare the result with the teen size chart. For period bikinis, choose one size larger where advised.

    SIZE
    UK/AUS SIZE
    WAIST
    HIPS
    M
    12
    70-75cm
    90-95cm
    S
    10
    65-70cm
    85-90cm
    XS
    8
    60-65cm
    80-85cm
    XXS
    6
    55-60cm
    70-75cm
    bottom of page