Birkenstock shoes are designed to give the foot room to rest naturally, so they may feel different from very narrow or sharply pointed footwear. Many shoppers prefer their usual size, but some opt to compare measurements with the size guide provided on the product pages. If you are between sizes, consider how you plan to wear them and whether you prefer a closer or more relaxed fit. Reviews and fit notes on individual styles, where available, can also help guide your choice.