Do Thinx and Ruby Love use the same absorbency labels?

No. Thinx publishes 3 current tiers (108 mL across the range) and Ruby Love publishes 1 (12.5 mL). Even where the words overlap, the millilitres differ, which is exactly why this page compares them in millilitres with a data-quality grade on every number.

How do Thinx and Ruby Love sizes compare?

Thinx runs true to size; Ruby Love runs true to size. Both size from your hip measurement, so the size finder gives your size in each brand directly rather than guessing from the other brand's number.

Is Thinx or Ruby Love better?

Neither is better across the board - they differ on measurable things. Compare three numbers on this page: the millilitres at the tier you actually need (not the tier names), how each brand's sizing runs for your hip measurement, and current prices in the catalog. The right brand is the one whose numbers fit your flow and your body, and that answer differs by person.

Thinx vs. Ruby Love

How Thinx and Ruby Love period underwear compare on the only thing that travels across brands - capacity in millilitres - plus how each one's sizing runs. No brand's thumb on the scale.

Updated 2026-06-12 · Every capacity is the brand's own claim, graded and dated

By their own published claims, Thinx reaches a higher maximum capacity (up to 108 mL) than Ruby Love (up to 12.5 mL) at its highest current tier. That does not make every Thinx pair more absorbent than every Ruby Love pair - it means the top of Thinx's range is higher. Compare tier by tier in millilitres, not by the label words.

Absorbency tiers, side by side

Thinx

See Thinx

Tier	Capacity	Grade
All Day	108 mL	Data quality grade B, converted from tampon counts
All Night	108 mL	Data quality grade B, converted from tampon counts
Overnight (Teens)	108 mL	Data quality grade B, converted from tampon counts

Verified against Thinx's own pages 2026-09-05

Ruby Love

See Ruby Love

Tier	Capacity	Grade
Period underwear (one level)	12.5 mL	Data quality grade B, converted from tampon counts

Verified against Ruby Love's own pages 2026-06-05

Claims, not lab measurements

Every capacity above is the brand's own maximum claim, typically from a saline saturation test. The only published study with real blood components (BMJ Sexual & Reproductive Health, 2023) measured period underwear holding under 3 mL each, 2 mL on average, before leaking - far below these maximums. Use the numbers to compare the two brands like for like, not as a leak-free guarantee.

Sizing

Thinx runs true to size; Ruby Love runs true to size. Both brands size from your hip measurement, so rather than converting one brand's size into the other's, the size finder gives you your size in each directly.

Thinx: Runs true to size. Thinx states styles are "completely true to size" and recommends following the HIP measurement (measured at widest point, derriere included) for the most accurat

Ruby Love: Ambiguous in brand materials. The sizing guide and FAQ say buy "True to size for best fit" and that underwear "should fit comfortably snug for maximum leak-proof performance." Howe

Quick answers

Is Thinx or Ruby Love more absorbent?: By their own published claims, Thinx reaches a higher maximum capacity (up to 108 mL) than Ruby Love (up to 12.5 mL) at its highest current tier. That does not make every Thinx pair more absorbent than every Ruby Love pair - it means the top of Thinx's range is higher. Compare tier by tier in millilitres, not by the label words. And remember these are saline-lab maximums, not leak-free guarantees - the only blood-component study measured far lower real capacity.
Do Thinx and Ruby Love use the same absorbency labels?: No. Thinx publishes 3 current tiers (108 mL across the range) and Ruby Love publishes 1 (12.5 mL). Even where the words overlap, the millilitres differ, which is exactly why this page compares them in millilitres with a data-quality grade on every number.
How do Thinx and Ruby Love sizes compare?: Thinx runs true to size; Ruby Love runs true to size. Both size from your hip measurement, so the size finder gives your size in each brand directly rather than guessing from the other brand's number.
Is Thinx or Ruby Love better?: Neither is better across the board - they differ on measurable things. Compare three numbers on this page: the millilitres at the tier you actually need (not the tier names), how each brand's sizing runs for your hip measurement, and current prices in the catalog. The right brand is the one whose numbers fit your flow and your body, and that answer differs by person.

Skip the comparison - get your answer

Tell the translator your flow and it gives the covering tier at both Thinx and Ruby Love. Tell the size finder your hip and it gives your size in each.

What absorbency do I need?Find my size