Keep the system visible
US men’s and US women’s scales are different. EU, UK and centimetre labels should not be mixed into a single unexplained number.
Use the brand chart
Check the chart linked to the specific regional product. Do not assume that your size in another brand or generation transfers perfectly.
Consider width
A correct length can still feel wrong when width or volume differs. Note the width designation alongside the size in your profile and reviews.
Preserve return options
Review try-on and return conditions before committing to outdoor use. The directory records size context rather than promising a universal conversion.