The data-driven bra sizing resource

Every band, every hardware — ranked by the numbers, not the marketing.

Think Bra reviews and compares the best everyday, sports and nursing bras with Hold Index™, our transparent, quantitative scoring system. We generate a head-to-head comparison for every possible matchup, crown a clear winner, and rank the genuine best of each category for every kind of wearer.

Browse Categories See the Best Lists

0: Categories
0: Products scored
0: Comparisons
0: Wearer profiles

How Hold Index works

Every product is broken down spec by spec. We normalise each measurement onto a 0–100 quality scale, weight it by how much it actually matters for real-world performance, and combine them into one transparent score out of 100. Read the full published methodology.

1. Spec-driven

Band weight, garment range, cup clearance, rolling resistance and more — pulled from manufacturer data and normalised so every spec is comparable.

2. Quantitative & weighted

Each spec carries a weight based on how much it influences performance. No vibes, no sponsorships — the math decides the ranking.

3. Avatar-aware

We re-weight the same data for each kind of wearer — beginner, commuter, everyday racer, value — to build genuinely useful best-of lists.

Shop by category

All categories

Top-rated in every category

The current Hold Index leader in each class.

Featured best lists

Latest news

All news

Start here: guides

All guides

Bra Size Chart: Band and Cup Conversions Across US, UK, EU and AU Size Runs

Anyone holding a tape measure who needs the band and cup that correspond to their actual numbers in every system they might buy from. · 10 min read

How to Measure Your Bra Size — and Why the +4 Rule Still Gets It Wrong

Anyone with a tape measure who wants a size derived from their own body rather than from a heuristic written in the 1930s. · 10 min read

Sister Sizes: Which Bra Sizes Hold the Same Cup Volume

Anyone whose band is wrong but whose cup volume is right, and who needs the equivalent size that keeps the volume and changes only the band. · 9 min read

Why a 34DD Isn't a 34DD: Bra Sizes by Brand Across 30 Size Runs

Anyone who knows one size that works and needs to translate it into a brand whose run is drafted from a different block, under a different band rule. · 11 min read

The world's top wearers

All profiles

Profiles of the best in the world across 0 categories.