They say it helps reduce the friction between the base and snow. These dimples are elongated, not circular like a golf ball, and arranged lengthwise. Think along the lines of a skinny football shape.
16 NS West . 15 NS Snowtrooper Brother in Arms Edition . 13 Salomon Pow Snake
16 Rome Katana . 15 Now Drive . 14 Burton Genesis
14 Flow Hylite