Thinx

All-Day Brief

Name: Thinx All-Day Brief
Brand: Thinx
Price: 19 USD
Availability: InStock

$19

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Price & stock checked 2026-09-06Absorbency data No tracking

If you buy through this link the brand may pay us a commission, at no cost to you. It never changes our numbers. Disclosure

What “All Day” means here

Thinx's All Day tier holds 108 mL Data quality grade B, converted from tampon counts by the brand's own published claim ('Absorbent layers hold up to 12 regular tampons' worth' (thinx.com/pages/how-they-work and All Day PDPs, re-verified 2026-09-05); Thinx publishes no millilitre figure for its period underwear. 108 mL is our computation, not a brand figure: 12 regular tampons at the FDA regular-absorbency ceiling of 9 g (21 CFR 801.430, greater than 6 g up to and including 9 g), which is the same 9 mL per regular tampon this table uses for Thinx's legacy ladder; the FDA floor of 6 g gives 72 mL. The 'up to 100 mL' on how-they-work is the bladder-leak line's figure (Thinx for All Leaks), stated in the FAQ answer about light bladder leaks; identical wording on the 2026-05-08 and 2026-07-03 Wayback snapshots. The 2026-06-10 verification misattributed it to the period line.).

How we verify and grade these numbers

Sizesstock checked 2026-09-06

9-10
11-12
13-14
15-16

Not sure which size? One hip measurement answers it for every brand.

Over two years

This pair

$19

once - built to last about two years with normal care (the brand's own guidance).

Disposables

$120 to $288

over the same two years, at $5 to $12 a month - a commonly cited range.

A reusable pair only replaces disposables on the days you actually wear it, so your real saving depends on how often you reach for it. The more you do, the further a one-time $19 goes against a monthly cost. These are illustrative figures you can adjust, not a measured PeriodFinder number.

This absorbency in other brands' language

Thinx All Day holds about 108 mL. To get the same real coverage elsewhere, you'd need:

Knix
Ultra(63–99 mL)Data quality grade C, conflicting / unconfirmed claim
Modibodi
Super(50 mL)Data quality grade A, brand publishes mL
Saalt
Super(40–50 mL)Data quality grade B, converted from tampon counts
Proof (Proof by Always)
Overnight (Hi-Rise / Boyshort)(45 mL)Data quality grade B, converted from tampon counts
Ruby Love
Period underwear (one level)(12.5 mL)Data quality grade B, converted from tampon counts
The Period Company
Heavy(45 mL)Data quality grade B, converted from tampon counts
Bambody
High Absorbency(10 mL)Data quality grade C, conflicting / unconfirmed claim
Aisle
Super (Heavy / overnight)(40 mL)Data quality grade A, brand publishes mL
WUKA
Super Heavy(60 mL)Data quality grade A, brand publishes mL
Rael
Reusable Boyshort(15–25 mL)Data quality grade C, conflicting / unconfirmed claim
Hanky Panky
Regular(15 mL)Data quality grade B, converted from tampon counts
Skims
Period Panties Brief(15 mL)Data quality grade B, converted from tampon counts