I bought two of these for use at our local pool, and for a beach vacation later in the summer.  Even though my daughter is 2 1/2, I bought the three-year size after going over the measurement/size chart.  So far, the diapers have held up well to chlorine and to being washed in the machine (air dry, please!)  My daughter doesn't complain about the leg or waist elastic; and the openings are definitely snug enough to contain anything that might fall their way.  I also like the fact these diapers have some light absorbancy in them.  They also are roomy enough to wear over a disposable swim diaper, if you needed to.  (Some pools are extra-fussy about that.)  The diaper does stick out beyond the leg holes of my daughter's swimsuit, but that doesn't bother me.