Sandals & slides size guides

Sandals break the usual US/UK rules — Birkenstock uses EU as the primary label, Crocs runs large with roomy footbeds, and adjustable straps hide some length error but not width mismatch.

Model-level fit verdicts

Birkenstock Arizona Confidence 69%
Birkenstock Boston Confidence 67%
Birkenstock Gizeh Confidence 65%
Crocs Classic Clog Confidence 72%

Brand hubs

Birkenstock — EU-first, runs large
Crocs — roomy, size down
UGG slides & fluff
Adidas Adilette

Common category questions

Do Birkenstocks run true to size?

Birkenstock sandals use an EU-first footbed system, so they often feel large compared with US sneaker labels. Start from the brand chart and confirm regular vs narrow width; footbed width matters as much as length.

Should you size down in Crocs?

Crocs Classic Clogs run roomy by design. Start with your usual US size if you want the intended loose fit, and check a half size down only if heel slip is the main problem. Lined Crocs feel smaller because the liner takes interior volume.