remember to never get your cork sandals saturated. this protectant will help from damage to the leather and also the cork. avoid leaving birks in extreme heat or sunlight. this will Crack the cork. however, they have been sealed. so you can rest assured, if the sun moves directly over them while your sunbathing or swimming, you won't have to be as concerned!! hope you enjoy your birks for a very long time !! *** btw !! I also use this on all of my cork & leather shoes before I ship. vionics tory birch etc. any brand with leather and/or cork.To See my birks, go to the top of my closet to search bar and type birkenstock OR GO to main menu. go to brands and type birkenstock. you'll see what's in stock. if u need help reach out! !Btw - to see what I have in stock, go to my closet, and type birkenstock in the search bar