A size 10 in Nike often fits differently than a 10 in Converse or Yeezy. Check brand-specific size charts and read user reviews to see if they run "true to size" (TTS).
Sites like Nike , Adidas , and New Balance are the safest bet for brand-new releases and easy returns.
When buying from third-party sellers, always ensure there is a verification process to avoid fakes.
If you’re looking for sold-out grails, StockX , GOAT , and eBay (with their Authenticity Guarantee) are the industry standards for verified sneakers.