Check out the Size Guide available on each product page. The best way to find your perfect fit is by measuring the sole of your barefoot in cm/in from the toe to the heel, in a straight line. Then, you just need to find the corresponding size. Here’s another important tip: if you’re a half size, we recommend you purchase the larger size. Your feet will have a little extra space, which is great especially if you wear socks with the shoes or for those days when your feet are a bit more swollen than usual.

Please contact us to confirm if the model will be restocked – and when. In the meantime, sign up on our website and activate the stock alert notification on the product page. Just click on the sold-out size and select the "I want to be notified quickly" button. You will then be notified via email when/if this model is back in stock. There might also be returns of the shoes in your size from other customers.

NAE shoes are made from a range of plant-based and recycled vegan materials — never anything from an animal. The mix depends on the shoe, but the core materials are:

• Cork — harvested from the bark of cork oaks without felling the tree; light, water-resistant and naturally renewable.
• AppleSkin — a leather alternative made partly from apple waste from the juicing industry.
• Piñatex — a textile made from pineapple-leaf fibre, a by-product of the fruit harvest.
• Recycled PET — fabric and linings made from recycled plastic bottles.
• Organic cotton — used in laces, linings and details.
• Certified vegan microfiber — durable and OEKO-TEX Standard 100-certified, used where a style needs extra strength and structure.

As a rule, the more natural the material, the lower its footprint — cork and organic cotton sit right at that end. But a shoe also has to last: one that falls apart in a season is the least sustainable choice of all, whatever it's made of.

So the material depends on the shoe. Where a style needs extra strength, structure or water resistance, we use harder-wearing materials such as our certified vegan microfiber — even though its footprint is higher than cork's. Where a softer, more natural material does the job, we use that instead.

Not every material suits every type of shoe. Matching the right vegan material to the right style is how we keep NAE both responsible and built to last.

The Standard 100 certificate issued by OEKO-TEX® ensures the total absence of harmful chemicals and certifies that a particular product is not hazardous to the environment or the consumer’s health. The tests are conducted by OEKO-TEX® independent partner institutes, based on an extensive catalogue of criteria and requirements.

The Global Recycled Standard (GRS) is an international certification for products made with recycled materials. It independently verifies how much recycled content a product contains and tracks it through the supply chain, while also setting environmental and social requirements for how the material is processed. We use GRS-certified materials, such as recycled PET, so the recycled content is verified rather than simply claimed.

The Global Organic Textile Standard (GOTS) is the leading certification for textiles made from organic fibres, such as organic cotton. It confirms that the fibre is grown organically and that strict environmental and social standards are met at every stage of processing, from harvest to finished material. We use GOTS-certified organic cotton, so its organic origin is independently verified.

Our cork comes from Portugal — the world's largest cork producer, where cork oaks have been cultivated for generations. It's one of the most sustainable materials we work with: harvested by hand from the bark of the cork oak, which is carefully stripped without cutting down or harming the tree. The bark grows back, and the same tree can be harvested roughly every nine years for more than a century. It's also the material that gives many NAE styles their distinctive, natural texture.