Proof (Proof by Always)
Proof (Proof by Always)'s sizing and absorbency, translated onto the same scale as every other brand - so you can shop it (or leave it) with a fair comparison.
How Proof (Proof by Always) sizing runs
Proof publishes no runs-small or runs-large statement. Its only fit guidance: if your measurements fall in different size categories, follow your hip, and the right size is the one you feel best in.
| Size | Hip | Waist |
|---|---|---|
| XS | 33–35" | 23–25" |
| S | 35–38" | 25–28" |
| M | 38–41" | 28–31" |
| L | 41–44" | 31–34" |
| XL | 44–47" | 34–37" |
| 2XL | 47–50" | 37–40" |
| 3XL | 50–54" | 40–44" |
Know your hip measurement? Get your size in every brand at once.
What Proof (Proof by Always)'s tiers claim, in millilitres
- Super-Light5 mL Data quality grade B, converted from tampon counts
- Light5 mL Data quality grade B, converted from tampon counts
- Moderate15 mL Data quality grade B, converted from tampon counts
- Heavy20 mL Data quality grade B, converted from tampon counts
- Super-Heavy25 mL Data quality grade B, converted from tampon counts
- Overnight (Super Heavy Brief)35 mL Data quality grade B, converted from tampon counts
- Overnight (Hi-Rise / Boyshort)45 mL Data quality grade B, converted from tampon counts
Claims verified 2026-06-10 · Catalog checked 2026-10-04 · Millilitres are the brand's own published claims, normalized - methodology. Cross-brand view: the full table.
No live Proof (Proof by Always) catalog
Proof's own online store stopped taking orders in January 2026. The line is sold at Target as Proof reusable period underwear, powered by Always, and Amazon lists it under "Proof." We keep its size chart and tier figures so the translation still works if you own or are considering a pair.
Where to buy:Buy at TargetSearch Amazon
Your size and tier at this brand
One hip measurement gives you a size here and at every other brand, and your flow in plain words gives you the tier that covers it.