Volume curve is the shape of the foam distribution along the length of the board. Two boards can have the exact same total liter count but feel completely different to surf because of where that volume sits — bunched up in the chest area, evenly spread, or pulled forward into the nose.

What it does on a surfboard

The volume curve determines how the board paddles, planes, and turns:

Front-loaded volume (foam pushed forward of center) gives more paddle power and earlier planing — the chest-area foam catches the water and gets the board moving sooner. Common on grovelers and daily-driver HPSBs.
Center-balanced volume (foam evenly distributed) gives the most predictable turning — when you pivot, the board rotates around the wide point smoothly. Common on contest HPSBs and mid-lengths.
Tail-loaded volume (foam in the back third) gives more drive and step-up confidence — the tail-area foam holds a line through bigger faces. Common on guns and step-ups.

Two boards at the same length and width can have radically different volume curves and ride completely differently.

What to look for

Lundquist's house style pulls volume forward of center with a thinned-out tail signature — the daily-driver brand promise. The forward foam paddles like a grovel; the thin tail keeps the board lively and responsive when you weight the back foot. On a model page, look for the volume figure paired with the foil description for the full picture.