The manufacturer doesn't specify the diameter of these long 72-inch noodles, but reviewers report that they're fun for both adults and kids. While most pool noodles are foam, inflatable plastic options are a must if you need to maximize storage, since these noodles can be deflated. The disadvantage is that they can pop, and popped noodles won’t work as floatation devices anymore. (On the flip side, even when foam noodles degrade, leaving bits of foam floating around, they still remain functional.) Vinyl-dipped foam noodles should last longer than undipped foam, but come with a higher price that may not be worth it if you need lots of noodles or don't use them very often. Overall, this is a durable, well-designed noodle for both kids and adults, and it even comes in six different colors and a few different styles.