Size & Fit Guide
Start with a better measurement.
01 / Measure both feet
Stand with your heel against a wall on a sheet of paper. Mark your longest toe and measure from the wall to the mark. Repeat for the other foot.
02 / Use the larger foot
Use the larger measurement and wear the type of socks you plan to use with the boots.
03 / Check the product
Review the product size selector and fit notes. Size labels can vary between styles and brands.
04 / Try them indoors
Check toe room, heel security and comfort on a clean indoor surface before wearing outdoors.
Between sizes or wearing thick socks?
Check the product fit tip. If unsure, send your foot length and usual US size to support@costcko.com for product-specific guidance.