AI Sneaker Expert: your exact size in every brand and the pair you actually need

An AI sneaker expert solves the problem online stores have spent years not solving: every brand sizes differently, and nobody asks what you actually need the pair for. Jay, NAIARA's sneaker expert, is the modern shoemaker everyone ends up asking the same thing — "what shoes should I buy?" — and he always nails it, whether it's 60-euro Vans or 600-euro Oxfords. His number-one obsession is fit: he knows Nike runs small and Converse large, matches your foot to each model's last, and saves you the return. Then he goes to real use: he asks what you want them for and gives you the two best options with reasons, no manufactured urgency. And he protects you from fakes: he knows real market prices, fees included, and his alert fires when something drops 40% below market. NAIARA gathers 59 specialized AI agents; Jay is free to start on Google Play and the App Store.

The problem: buying shoes online is a sizing lottery

Anyone who buys footwear online knows the ritual: order two sizes, return one (or both), repeat. It's not your fault: "your size" doesn't exist — your size in each last does. A US 10 in Converse is not a US 10 in Nike, and within Nike some models run small and others don't. Add scarcity marketing on top — "last units", drops, hype — pushing you to buy fast and think later.

The result is closets full of beautiful pairs that hurt, and feet that pay the bill. Jay's rule cuts through all of it: if it doesn't fit, nothing else matters. Not the colorway, not the limited collab, not the discount. Fit first, everything else after.

What Jay knows how to do

Your size, per brand and per model

Jay doesn't ask your size — he asks about your foot. Width, instep, whether you feel pressure in the toes, which sizes you wear in which models and how they feel. With that, he matches your foot to the last of each specific model and tells you what size to order in every brand — and when a model simply isn't made for your foot, however much you love it. It's the knowledge only the veteran clerk at the neighborhood shoe store used to have: there's a last for every foot, and knowing yours saves you returns, blisters and dead purchases.

The pair for your real use, not the shop window

"What do you want them for?" is Jay's first question and the one almost nobody asks. Walking the city eight hours a day, training at the gym, running three days a week, a June wedding: each use demands different things from the sole, cushioning and materials. Give him use and budget and he returns the two best options with their whys — never an endless list, never "last units" pressure. And when the question is looks, he commands dress codes and color rules, cultural sensitivities included: in Japan, pick a shoe that slips off easily. For the full outfit, his colleague Inés, the stylist, builds the look around the pair.

Running shoes with data, not marketing

The running aisle is the most expensive one to translate: this-generation foam, 8 mm drop, carbon plate, endless spec sheets. Jay brings it down to earth: which foam your model uses and how it ages, what drop means for your stride, whether a carbon plate adds anything at your pace or is money burned. And the advice that prevents the most injuries: cushioning dies before the outsole, so rotate at around 600 km even if the shoes "look new". He keeps count with you — tell him your mileage and he flags when your pair is asking for relief.

A cared-for collection and an anti-fake radar

If your thing goes beyond daily wear, Jay helps you maintain the collection: each pair's condition, mileage, and exact care by material — suede isn't cleaned like mesh, and white leather has its tricks. For resoling, go to the cobbler: he'll tell you himself that's not his lane. In buying and selling, he's your insurance: he calls the real market price with fees included, and if something appears 40% below market, the possible-fake alert fires. Bots and cook groups? Off the table — they end in bans. And if the goal is paying less for a legitimate pair, Rita, the deal hunter, watches prices for you.

What Jay doesn't do

Jay can't measure your foot physically: he works from what you tell and show him, so for very particular feet (bunions, orthotics, extra-wide) the final word belongs to the fitting room or a podiatrist. He doesn't authenticate a pair in hand — that's for specialized services with the physical shoe — though he will tell you when a deal smells wrong. He doesn't repair: resoling and stitching belong to the cobbler. And he doesn't feed the hype: if a limited drop doesn't fit you or your use, he'll tell you to let it go, even if it stings.

Getting started

1. Download NAIARA and open a chat with Jay.
2. Tell him which sneakers you wear now, in what size, and how they fit — that's how he calibrates your foot.
3. Tell him what you're looking for and your budget. Two options, reasons, and the exact size per brand.

Jay is part of NAIARA's fashion and design vertical — the full map lives in the AI for fashion and design guide. If the craving is for your wrist instead of your feet, James, the watch specialist, applies the same rigor to another obsession; and to gift a pair without fear of missing, Stella, the gift finder, closes the deal.

Frequently asked questions

How do I know my exact size in each brand?

Every brand uses different lasts: Nike runs small, Converse large. Jay matches your foot's shape to each model's last and tells you which size to order — no more returns roulette.

What sneakers should I buy?

Depends on the use, which is Jay's first question. Give him real use and budget and he returns the two best options with reasons, no fake urgency. If they don't fit, nothing else matters.

How often should I replace running shoes?

Around 600 km, depending on foam, weight and surface. Jay decodes foam, drop and carbon plates, and warns you when the cushioning has died even if the outsole looks alive.

How do I spot fake sneakers?

By price: Jay knows real market value with fees, and his alert fires at 40% below market. Buy through guaranteed channels; avoid urgency, bots and cook groups.

Does it work for dress shoes too?

Yes: from 60-euro Vans to 600-euro Oxfords, with dress codes, color rules and cultural sensitivities included.

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Ask Jay before your next pair. Download NAIARA on Google Play or the App Store and meet all 59 specialized agents. If it doesn't fit, nothing else matters.