I've been using Miami sandals for a good while and rule of thumb is to always buy 1 to 1.5 size larger than your current size.  That is a must.  I'm an 8.5M and a 9M 10 % of the time and I always get a 9.5M.  I might be able to go for a 10, but I'm fine with the 9.5M to avoid too much width. They are very stylish and comfortable but don't expect cushion or support because these would not be the sandals for you.  They are expensive and all leather and if you find them below $50 grab them before they are sold out.  They usually run over $100 and are sold in exclusive stores.  So glad Amazon had them and at a good price.