Adidas vs PUMA Kids: how to compare shoe sizes for school and sport.

What the official size guides say

The official Adidas kids' footwear size guide provides conversions and reference measurements for finding a size. It is the starting point for an Adidas purchase, not a universal chart for every children's trainer.

The official PUMA size guide brings together the brand's tables for its categories and helps interpret a measurement for the product being considered. Open it again when the model, season or type of footwear changes.

Official charts are more useful than a remembered equivalence because they can be updated and because two footwear families can have different patterns. The numbers narrow the choice; the product details and movement test finish it.

The same number does not tell the same story

An EU size looks like a shared measurement, but in a children's purchase it is a translation inside a particular system. The number organises each brand's range; it does not describe the exact internal length, toe-box width or heel hold by itself.

Adidas and PUMA both cover different uses: school trainers, casual shoes, running, training and playground wear. A flexible, lightweight trainer may feel more forgiving than a structured one even when both show the same number. That is why this guide does not offer a blanket rule such as “PUMA runs bigger” or “Adidas runs smaller”. It would be too broad to help.

The useful question is different: how long is the foot today, and how does it behave inside this model? Once you save that answer, you can compare one purchase with another without turning a single experience into a rule for every child.

Start by measuring both feet

Measure at the end of the day if possible, after the feet have carried some weight. Your child should stand with weight evenly distributed and wear the sock used for school or sport. A seated measurement or a different sock can make the length and volume look smaller than they will be inside the trainer.

Place a sheet of paper against a wall and set the heel down without curling the toes. Mark the furthest point of the longest toe and measure from the edge of the paper to that mark in millimetres. Repeat with the other foot. Do not round before comparing the two results: a small difference may decide which foot sets the size.

Repeat the test if the heel moves away from the wall or the child loads one side. Save both measurements, the date and the sock used. Foot length is not a permanent property; it changes with growth and with the conditions of the test.

Foot length and toe room

Use the longer foot to enter the official chart. Then read the available room in the context of the activity and construction. The toes should be able to extend and move, but the foot should not slide forward on every step. Too much length can reduce stability, especially when the closure cannot control the extra volume.

Compare the foot measurement with the system named by the guide: centimetres, millimetres, EU, UK or US. Do not assume the EU number is enough to jump between brands. If the product page provides model-specific advice, give it priority over a generic chart.

An insole can help you check space when the construction allows it. Place the foot on the insole while standing, wearing the usual sock, and look at length and width. Do not use the insole as the only test: the trainer may have a different toe shape, heel structure or sole flex.

Width and the shape of the last matter too

A child can need a certain length and still need more room across the forefoot. Look for crowded toes, marks on the sides, tight seams, difficulty getting the foot in or a toe box that forces the toes into a narrow line. These signs point towards the last, not simply towards a longer size.

Sizing up to gain width can leave too much space in front and make the heel move. If the length is right but the sides press, look for another model, closure or construction with more volume. The brand name cannot replace looking at the shape of the actual trainer.

Instep height matters as well. Laces, elastic and hook-and-loop closures distribute pressure differently. With a high instep, check that the child can close the trainer without pulling the tongue to one side. With a narrow foot, make sure the heel stays held even when the toes have enough room.

School, playground and sport ask for different things

For school, the trainer may stay on for many hours. Prioritise comfort, stable heel hold, a closure the child can manage and a sole suitable for walking and play. A pair that works for a short run may not be the best choice if it is worn all day with a thicker sock.

For PE or training, watch how the trainer flexes, how stable it feels when turning and whether the heel stays in place. Toe room should allow movement, but a trainer that is too long can delay response and make tripping more likely. The real activity matters more than a generic “sport” label.

For everyday wear, think about the ground, the number of hours and the clothes around the shoe. A canvas pair and a padded trainer may need different decisions even if both are used for going out. Compare Adidas and PUMA like for like: school with school, running with running and casual with casual.

Closure, heel hold and independence

The best fit is one the child can maintain. Laces allow precise adjustment but take practice. Hook-and-loop closures make independence easier and can help secure a narrow heel. Elastic is quick, although it gives less control when the foot changes volume over the day.

Ask the child to walk, stop, turn and step up. Watch whether the heel lifts, the tongue shifts or the closure loosens. If the shoe has to be tightened hard to stop movement, the issue may be volume or shape rather than size.

Independence is part of the sizing decision. A trainer that feels perfect when an adult fastens it, but cannot be closed in the changing room, is not solving the intended use. Comfort has to exist when the child dresses without help too.

What to do between sizes

First identify the measurement separating the options. If the smaller size is short on the longer foot, the decision may be clear. If length works but the side is tight, going longer can create excess room in front without fixing the pressure. If both options let the heel move, change the last or closure.

Sensible growth room matters, but a school trainer needs to feel stable on the first day. A pair that will only work in three months can affect balance and gait now. Finding the needed room inside a construction that controls it is more useful than making the whole shoe larger.

When unsure, try both sizes late in the day with the usual sock and repeat the same movement route. Look at both feet and write down why you chose one option. That explanation will help more next time than remembering only “Adidas 35” or “PUMA 35”.

How to compare Adidas and PUMA step by step

1. Measure: record both feet in millimetres, standing and wearing the real sock.
2. Filter: open the official guide for each brand and locate the longer foot.
3. Match the use: compare school models with school models and sports models with sports models.
4. Review the shape: look at toe box, width, instep, heel, insole and closure.
5. Check the room: leave toe freedom without allowing the foot to slide.
6. Test movement: walk, turn, jump, squat and climb stairs.
7. Save the reference: note brand, model, measurement, sock and real sensation.

This order prevents brand or price from taking over the decision too early. If two models pass the test, you can then compare colour, materials, care and the child's preference. The size will no longer be a blind guess.

The five-minute movement test

With both trainers on and properly closed, ask your child to walk on a clear surface, rise onto their toes, bend gently, lift each knee and make two small jumps. Then check the heel and ask where there is pressure. “It presses at the front”, “my heel comes out” or “the side rubs” are much more useful answers than simply “it fits”.

Look for marks on the skin and see where the toes settle after a few minutes. Check that the sole flexes roughly where the foot flexes and that the closure stays closed. For school, repeat the test with a backpack; for sport, use the sports sock and add a change of direction.

Common mistakes when comparing the brands

The first is copying one brand's number into the other without measuring. The second is measuring only one foot. It is also common to size up because of growth, try shoes while seated or mistake a width problem for a lack of length.

Another mistake is comparing a school trainer with a running shoe and blaming every difference on Adidas or PUMA. Pattern, insole, closure, material and sole may explain more than the logo. Even within one brand, one kids' footwear family does not represent all the others.

Finally, do not turn one child's experience into a general rule. Save the reference for that foot and that model. When you buy again, measure from scratch and check what changed: length, width, sock, activity or construction.

Use SIZES to keep the reference

Record both foot lengths, the longer foot, date, sock, activity and fit notes. A note such as “Adidas, school, 218 mm, hook-and-loop, free toe box and secure heel” will help more than “size 35”. When your child grows, you will know which part of the decision still applies.

To prepare the rest of the outfit, read how to choose a kids' jogger size, review how to measure kids' clothes at home and compare other trainers in Nike vs New Balance Kids or Nike vs Adidas Kids. You can also browse all size guides.

The final recommendation

Adidas and PUMA provide charts that help you begin, but no automatic equivalence replaces measuring the foot. Use the longer foot, review width and use, confirm the exact model and let movement decide. That makes the comparison useful for buying better, not for memorising a number.