Why Shoe Sizing Is Tricky
Shoe sizing is the number one cause of returns on CSSBuy. The problem is that sizing is inconsistent across brands, models, and even batches. A size 10 in one model might fit like a size 9.5 in another. Chinese sizing charts are based on centimeters, which is more accurate than US or EU sizes. Learning to use the centimeter chart is the key to getting the right fit.
The rep community has a simple rule: always measure your foot and compare to the size chart. Never order based on your usual US size. This rule alone will prevent 80% of sizing mistakes. This guide walks you through the entire process.
How to Measure Your Foot
The correct way to measure your foot is to stand on a piece of paper and trace around it. Wear the socks you plan to wear with the shoes. Place your full weight on the foot while tracing. Measure the longest distance from heel to toe in centimeters. Do this for both feet—most people have one foot slightly larger than the other. Use the larger measurement.
Measure in the evening, when your feet are at their largest. Feet swell during the day, and morning measurements can be too small. If you are between sizes, always round up. It is better to have a shoe slightly too big than too small. You can add an insole to a big shoe, but you cannot stretch a small one.
Foot Measurement Steps
- Stand on a piece of paper with your heel against a wall
- Mark the longest point of your toe with a pen held straight up
- Measure the distance from wall to mark in centimeters
- Measure both feet and use the larger measurement
- Add 0.5cm for comfort, or 1cm if you prefer a loose fit
Reading the Size Chart
Every seller on CSSBuy provides a size chart. The chart lists sizes in US, EU, UK, and centimeters. Ignore the US, EU, and UK sizes. Focus only on the centimeter column. Find your foot measurement in that column and order the corresponding size.
If your foot measures 28.5cm and the chart shows size 10.5 at 28.5cm, order size 10.5. Do not try to convert to your usual US size. The centimeter measurement is the most accurate because it is based on the actual length of the shoe insole.
Brand-Specific Sizing
Different brands fit differently. Nike and Jordan models tend to fit true to size or slightly narrow. Adidas Yeezys often run small, so many buyers size up by 0.5. New Balance models vary by silhouette. Running shoes usually fit snug, while lifestyle models might be roomier.
Boots and high-tops often fit tighter around the ankle. If you have wide feet or high arches, consider sizing up by 0.5. Slides are the most forgiving—most people can wear their true size. However, some slide models run narrow, so check reviews before ordering.
Common Sizing Mistakes
The biggest mistake is ordering based on US size without checking the chart. A US 10 in one model might be 28cm, while a US 10 in another model is 28.5cm. The difference is enough to make the shoe unwearable. Always check the chart for the specific model you are buying.
Another mistake is not accounting for width. Some shoes are narrow, especially dress shoes and certain running models. If you have wide feet, look for wide-width options or size up by 0.5. The size chart usually only shows length, not width. Read reviews to see if buyers mention narrow fits.
Width and Arch Considerations
Width is just as important as length. Standard shoes are medium width (D for men, B for women). If you have wide feet, look for wide options (E or EE). Reps rarely come in wide sizes, so you might need to size up by 0.5 to compensate for width.
Arch support varies by model. High-tops and boots usually have more support than low-tops. If you have flat feet or high arches, consider adding an insole. Some buyers replace the stock insole with a custom orthotic for better comfort.
Kids vs Adult Sizing
Kids sizing is completely different from adult sizing. Kids shoes are sized by age ranges, not centimeters. If you are buying kids reps, find the equivalent adult size and convert. The conversion is not straightforward, so ask the seller for help if you are unsure.
What to Do If the Size Is Wrong
If you receive the wrong size, request an exchange within the 7-day window. CSSBuy will coordinate with the seller. Most sellers accept exchanges for sizing issues, but you might pay for return shipping. The return process takes 3-5 days.
If the seller does not accept exchanges, you can sell the item on community forums. Many buyers sell ill-fitting reps to recoup some of the cost. This is not ideal, but it is better than keeping an unwearable shoe.
Final Sizing Tips
Always measure your foot in centimeters. Always check the size chart for the specific model. When in doubt, size up. Read reviews for fit notes. And remember that reps can vary slightly from retail sizing, so allow a small margin for error.