I love Sanuk's shoes because they are quite durable and have a wide toe box. They slip like crazy on my normal sized heels. The trick I learned is to check the Sanuk website and see what they recommend (i.e. they will actually tell you to go a size up or down depending on the model). I find it insane and annoying that they don't adhere to the same final standard for shoe sizing. Another trick is to avoid all sanukas with this heel design, which is just a collarless piece of cloth. I noticed that the Sanux with the heel collar wraps the foot better and slips less.