Solid closed cell EVA foamnWill not chip or water lognDurable kickboardnSize: 21u0026#34; by 11.5u0026#34; by 1.25u0026#34;nGrab hold and let 'er rip. Solid closed cell EVA foam construction will not chip or water log. Used and approved by 1972 Olympic Gold Medalist and World Champion swimmer, Keena Rothhammer.