Birkenstock, Arizona white sandal

I am listing the sandals as a size 10 when in fact, they are a size 11. The reason I’m doing that is because typically I wear anywhere between a nine and a 10 usually nine and 9 1/2 but during my pregnancy my feet a bit.I feel like these fit perfectly. These were a handful of times during my pregnancy or once or twice when I went to the store since then.