Footwear Size & Width Guide
Understand A, B, D, 2E and 4E—including why A means Narrow for women and D changes meaning between men's and women's sizing.
View footwear guide →Sizing Chart
Confluence Running Fit Resources
Find your starting point faster.
Sizing should make shopping easier, not create another guessing game. Use these guides for footwear widths, sports bras, apparel, kids, socks, compression and brand-specific sizing.
When a brand or product uses its own system, we call it out instead of forcing it into a generic chart.
Plain-language sizingTechnical codes translated into terms you can actually use.
Brand-aware guidanceWe preserve differences that matter instead of over-generalizing.
Built for runnersFit guidance considers movement, comfort and performance.
Choose a sizing guide
Start with the category you are shopping. If a product has its own brand or style notes, those should take priority over a generic conversion.
Sports Bra Sizing
Band/cup, numeric and alpha sizing, plus measurement and running-specific fit checks.
View bra guide →Women's Apparel Sizing
Measure bust, waist, hips and inseam and decide what to prioritize when between sizes.
View women's guide →Men's Apparel Sizing
Chest, waist, hips and inseam guidance for technical running layers and bottoms.
View men's guide →Unisex Sizing
Learn whether a product is built on men's, women's or a brand-specific base scale before converting.
View unisex guide →Kids' Sizing
Allow reasonable room to grow without sacrificing control, comfort or safety.
View kids' guide →Sock Sizing
Use shoe-size ranges, heel placement and toe fit to choose a better running-sock size.
View sock guide →Compression Sizing
Choose sizes from the measurements that actually determine garment pressure and fit.
View compression guide →Brand Size Guides
Use brand-specific resources whenever a general chart is not precise enough.
View brand guides →Oiselle Size Guide
Numeric, extended, alpha and bra sizing with current product-specific guidance.
View Oiselle guide →Sizing and fitting are related—but they are not the same.
Sizing answers “where do I start?”
Examples: What does a women's D width mean? Which apparel size matches my measurements? Which sock size range includes my shoe size?
Fitting answers “what actually works?”
Fit goes further: foot shape, heel security, midfoot volume, forefoot geometry, toe depth, cushioning, stability, intended activity and how a specific product interacts with your body.
How to use these guides
Choose the category.
Start with the guide for the product you are shopping.
Start with the guide for the product you are shopping.
Measure now.
Current measurements beat an old size label whenever possible.
Current measurements beat an old size label whenever possible.
Check the product.
Use brand- and style-specific notes when they are available.
Use brand- and style-specific notes when they are available.
Ask when unsure.
If you are between sizes or need a specialized fit, use the brand guide or contact us.
If you are between sizes or need a specialized fit, use the brand guide or contact us.
Need more than a size chart?
Our fitting process looks beyond a label or measurement to help match your foot and activity with the right product.
Follow the Journey
