A clog that is 100% vinyl I can wear I buy on Amazon, made by Backdoorshoes. It has a removable insert and I don't know what the insert materials are. The reason I hesitated to recommend it is because it has a wide front and with the insert removed it's made even wider. Plus these clogs squeak! Still, I have several pairs because I slip off my safe clean house sandals of vinyl or leather and put these on to go outside if walking on gravel or rocks. You might consider wooden clogs if they have an all wood footbed, some clogs have rubber on the bottom of the shoe but you won't have contact with the rubber, a common allergen. The trouble with all clogs is that they are elevated and that can be a hazardous if balance is an issue.