The Wedge is the go to skimboard for any wave riding beginner. The 5/8" core allows for more floatation while gliding out into deeper water Small: 40" x 17.5" x 1/2" Rider Weight up to 80 lbs Medium: 45" x 20" x 1/2" Rider weight up to 120 lbs Large: 49" x 19.75" x 5/8" Rider weight up to 140 lbs