These have been worn once so far, to an active water/kayaking day camp, and held up great.  They're easy to hand wash, and dry quickly.  For a kid with 21" waist, the size 5 is perfect, not too tight but won't fall down, and size 6 is fine too with room to grow but stretched out when wet.  I took photos of both pairs next to rulers, but can't seem to upload them.  The size 6 is 8 inches long on the outer side and 9 inches at waist (there's plenty of stretch, esp. when wet).  The size 5 is about 8.5 waist and 7.75 length at outer side.  Neither pair I got is lined, which is great for wearing them as shorts/for water sports on a hot day, and the patterns/colors I got (pink tye dye and rainbow butterfly) are not at all see-through.