Board rocker, explained

Rocker is the curve of a board from tip to tip. Every type the catalog draws, with how it tends to feel on the water and what it suits.

Flat rocker

Shape:
Almost straight through the middle, lifting only at the tips
Feels:
Fast and stable. It gets up on the water early and holds its speed. It can feel harsh in chop, and landings are firmer.
Suits:
Light wind, cruising and freeride, riders who want speed and upwind. Less suited to big jumps and rough water.

Low rocker

Shape:
One gentle curve from tip to tip
Feels:
A smooth, gentle curve. Easy and predictable in chop, and it gets going early.
Suits:
All-round freeride, learning, and flat to choppy water.

3-stage rocker

Shape:
Flat middle, with an angled section at each tip
Feels:
The flat middle gives drive and early planing, and the angled tips take the sting out of chop and landings.
Suits:
Freeride and light wind, for riders who want drive plus some pop.

Medium rocker

Shape:
One even curve from tip to tip, with moderate lift
Feels:
Balanced. It turns predictably, is smooth in chop, and the pop builds as you load it.
Suits:
An all-round choice for freeride and jumping.

Progressive

Shape:
Gentle through the middle, curving more toward the tips
Feels:
Calm underfoot, with the curve building toward the tips. It gives a controlled, strong pop and soft landings.
Suits:
Jumping, big air and freestyle.

Maximum rocker

Shape:
One deep curve from tip to tip, the banana shape
Feels:
A deep "banana" curve. Very soft landings and plenty of pop, but it gets going later, is slower and holds less upwind, so it needs more wind.
Suits:
Big air, freestyle, and rough water.

The curves are idealized. A real board's rocker won't look exactly like them. In general. Brands use these names loosely, and the outline, flex and fins change how a board feels as much as the rocker does.