I normally wear custom orthotics in my athletic shoes, but I lived in these sandals during a week-long kayaking/camping trip in the Grand Tetons, and 2 weeks in Kenya this year.  The sandals were immersed in mud in Kenya on several occasions, but no problem; just washed it right off.  There is decent foot support and the adjustable straps do a good job of keeping my feet in place, especially when wet, so that my feet aren't slipping around in them.  I love the feminine touches to the sandal.  I feel I can wear them with a casual skirt.  It's practically the only sandal I need on my trips.  I am so impressed with them that I now have it in 4 colors (pink, purple, blue, green).