Size Matters - Width
The width of a surfboard is measured at its widest point of the board. The wider the board, the more surface area the board will have. This will provide more side to side stability, which is ideal for beginner surfers or for surfing softer mushier waves.
A surfboard’s width also influences the amount of curve relative to the length that can be shaped into the plan shape. This is an important feature of surfboard design that will affect a board’s performance (see Rail line). The placement of the widest point of the board will influence its performance as well. The board is designed for speed and control in large waves if the widest point of the board is placed above the center. This is common in guns. Boards designed for smaller waves and more maneuverability typically have the widest point below the center.