While N stand for Narrow and M stands for Medium it should say W for women and M for men. Birkenstock is a unisex shoe and the N was created to allow for a better fit for women. I wear a standard medium width in all other shoes but the N fits me perfectly and allows me to walk without feeling like I need to use my toes… see more While N stand for Narrow and M stands for Medium it should say W for women and M for men. Birkenstock is a unisex shoe and the N was created to allow for a better fit for women. I wear a standard medium width in all other shoes but the N fits me perfectly and allows me to walk without feeling like I need to use my toes to stay in my shoes even after they stretch as all leather does with wear. see less While N stand for Narrow and M stands for Medium it should say W for women and M for men. Birkenstock is a unisex shoe and the N was created to allow for a better fit for women. I wear a standard medium width in all other shoes but the N fits me perfectly and allows me to walk without feeling like I need to use my toes to stay in my shoes even after they stretch as all leather does with wear.
By Kristine E. on March 18, 2019

Yes they are men's or women's
By Amazon Customer on November 24, 2016

Yes Authentic birks have two unique traits to look for. The footbed will state that they are birkenstocks and made in Germany. Additionally on the bottom of the sole the words “Birk” will be all over the bottom engrained in the soling design. Over the last 3 years Birkenstock stopped shipping their original footbe… see more Yes Authentic birks have two unique traits to look for. The footbed will state that they are birkenstocks and made in Germany. Additionally on the bottom of the sole the words “Birk” will be all over the bottom engrained in the soling design. Over the last 3 years Birkenstock stopped shipping their original footbed and soling materials to repair shops to stop counterfeits from being made with their original parts. We are one of 18 accounts nationwide who r authorized by Birkenstock USA to sell Birkenstock on amazon.com. Don’t buy from a retailer on amazon who doesn’t have a physical store with the same name as their amazon store. Hope this helps see less Yes Authentic birks have two unique traits to look for. The footbed will state that they are birkenstocks and made in Germany. Additionally on the bottom of the sole the words “Birk” will be all over the bottom engrained in the soling design. Over the last 3 years Birkenstock stopped shipping their original footbed and soling materials to repair shops to stop counterfeits from being made with their original parts. We are one of 18 accounts nationwide who r authorized by Birkenstock USA to sell Birkenstock on amazon.com. Don’t buy from a retailer on amazon who doesn’t have a physical store with the same name as their amazon store. Hope this helps
By Solely Comfort Footwear Seller on August 19, 2018

Birkenstock company says Amazon has no rights to their product and has been trying to stop them from selling because the company is not stocking them to Amazon. They claim they are fakes.
By JEM on July 5, 2021