Choose activity shoes by how they fit your feet and the activity you plan to do, not only by the number printed inside. Try both shoes with the socks you will actually wear, check the width and toe space, and move around before deciding.
A familiar size is a useful starting point, not a guarantee. The American Academy of Orthopaedic Surgeons explains that fit varies and that a larger size is not always the answer to a width problem. Compare the shape of the shoe as well as its length.
Start with the activity
Tell the person helping you what you plan to do. Walking, running, court sports, and a mixed exercise class ask different things of footwear. A fashionable trainer and a shoe designed for a particular sport are not automatically the same choice.
AAOS athletic-shoe guidance recommends selecting footwear appropriate to the activity. Use that principle to narrow the options before comparing colors or discounts. You can then focus on the models that serve the task rather than trying every attractive pair in the store.
If your routine covers several activities, explain that rather than pretending you need a specialist shoe for one sport. Ask what makes sense for your actual use. The decision should reflect your week, not a sport you rarely participate in.
Bring the right socks
Try the shoes with the type of socks you use for the activity. AAOS advises this because the fitting should reflect the conditions in which you will wear the shoes. A thin shop sock may not represent your usual pair.
Bring any prescribed insert and ask how to include it in the fitting. Do not assume it will fit comfortably simply because the shoe has removable padding. If you use an orthotic for a medical reason, seek guidance about suitable footwear rather than improvising a new arrangement.
Prepare the shoes as you would for exercise: loosen and adjust the fastening, place your foot properly, and secure it. Slipping a foot into a half-fastened shoe does not show how the pair will feel during the activity.
Check both feet and the whole fit
Try both shoes rather than approving the pair after checking only one. Feet can differ in size. AAOS recommends fitting the larger foot. If the other shoe feels loose, ask about the appropriate model or fitting solution rather than assuming you must accept it.
Notice the toes, sides, heel, and top of the foot. One comfortable area does not cancel pressure somewhere else. Describe the location of a problem so the person helping you can consider width, shape, or another model.
Do not solve every tight spot by choosing a longer shoe. Additional length may leave more room at the front while failing to address the original shape problem. Compare the relevant width or model instead of relying on a single adjustment.
Move before making the decision
Stand and walk in the pair where the shop permits. If the shoes are intended for a specific activity, ask whether there is a suitable way to assess that use. A few steps are more informative than looking at your feet while seated.
Check whether you repeatedly need to reposition your foot or tighten the fastening. Notice rubbing, slipping, or pressure rather than dismissing them because the shoes are new. A fitting should help you identify those issues before committing.
Take your time with this part. Comparing many pairs quickly can make it difficult to remember which one actually felt best. Write down the model, width, and size of the strongest option rather than relying on its color.
Use online shopping information carefully
If shopping online, read the model's sizing guidance and return policy before ordering. Reviews can reveal questions to ask, but another person's usual size and foot shape are not your own.
When the pair arrives, follow the seller's conditions for trying it while keeping it returnable. Test the fit before taking it outside for a full session. Keep the packaging and order details until you know the shoes suit the intended use.
Let comfort and purpose decide
A trend, an impressive specification, or a familiar size should not override an uncomfortable fit. If you have ongoing foot symptoms, a deformity, or special footwear needs, ask an appropriate health professional for guidance.
For the next purchase, bring your activity socks, try both shoes, and compare shape as well as size. Leave with a pair whose fit you have assessed, not simply one whose number matches the pair you bought last time.