I love Merrell shoes.  I am a poor grad student, but each year save up to buy one pair of Merrell sandals or slip-ons for the summer and one pair of loafers or boots for the winter.  This was my summer 2015 choice and they are in my top 3 pair of shoes in my whole collection (scared to admit how many I have).  They are so easy to slip on, dry out so fast after a hot and sweaty walk or skip in the rain, and amazingly comfy.  They have an arch, but not what I would call amazing arch support.  But that has never been a big concern for me.  What makes these super comfy for me:  lightweight, airy (breathe well), soft elastic around the edges, and slight curve shape that relaxes the foot when standing still.  Love them.  Love them so much I may just break my rule and get a second pair when I find them on sale.  I got the yellow/blue pair and would say the color is more like a neon greenish-yellow, which is a great summer color.  I wear them with any color and always get compliments.