The bottom sole is made of natural rubber. it is original and all models are design registered. it is completely handmade. it is vegan. it is environmentally friendly and recyclable. (eco-friendly) it is antibacterial, does not contain any carcinogenic and allergenic substances. it is very light and comfortable, creating a feeling of being absent. it does not deform in sea and pool water, does not fade from the sun and bleach. it does not sink in water, dries very quickly when wet. it is suitable for use. use detergent when washing in the washing machine and dry in the sun. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.