Heavy & Ultra-Heavy Flow Period Underwear
More protection.
Less worry.
Choose 35ml protection for heavy-flow days and nights, or up to 100ml for very heavy flow and greater reassurance. Discover soft, reusable period pants with extended back protection, available individually and in money-saving packs.
35ml–100ml absorbency
Extended back protection
Independently tested fabrics
Washable and reusable
Which protection is right for you?
Choose by absorbency first, then select the fit and fabric you prefer.
ULTRA-HEAVY FLOW
Up to 100ml
For very heavy flow, demanding nights and customers seeking Liberty’s highest absorbency.
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Soft bamboo-rich fabric
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Four absorbent layers
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Protection extending towards the back
Actual wear time varies by person and flow. Change your period underwear whenever needed.
Shop heavy-flow protection
Liberty’s highest-absorbency period underwear, created for customers seeking greater protection on very heavy-flow days and nights.
“I felt secure throughout the night and could finally relax.”
Chloe, verified Ultra-heavy flow customer
Protection you can trust
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 silver in the tested sections
No detectable silver in the tested sections
Hear from our customers
Get the fit right
Measure your waist and the fullest part of your hips, then compare both measurements with the Liberty size chart. Heavy and Ultra Heavy Flow pants should fit snugly and comfortably, without gaps around the legs or gusset.
SIZE | UK/AUS SIZE | WAIST | HIPS |
|---|---|---|---|
6XL | 26 | 109–114cm | 143–148cm |
5XL | 24 | 104–108cm | 127–142cm |
4XL | 22 | 98–103cm | 124–126cm |
3XL | 20 | 93–97 cm | 119–123 cm |
2XL | 18 | 100-105cm | 109–113 cm |
XL | 16 | 83–87 cm | 104–108 cm |
L | 14 | 78–82 cm | 99–103 cm |
M | 12 | 73–77 cm | 90-95cm |
S | 10 | 68–72 cm |
94–98 cm |
XS | 8 | 64–67 cm | 89–93 cm |