These sandals run a tad small so might want to order 1/2 size or so larger.  They fit like a glove and conform to your foot quite well.  They are not loose due to the great arch support and ergonomics.  So if you desire loose fitting, floppy sandals, don't buy these.  If you are flat footed, they probably won't be very comfortable.  I own several Olukai sandals and believe they are durable, just don't expect miracles if you run them in salt water EVERY day because they may delaminate.  Also, they look great!