How fins shape the way a board rides.

The foil is the cross-section of the fin — how the leading edge thickens and tapers from inside to outside. Think of it as the wing shape on the bottom of the board. It controls how the fin grips the water and how loose the board feels under your back foot.

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The five foil profiles you’ll see

• Flat foil — flat inside face. Maximum hold, used on side fins in most thruster sets.
• 50/50 — symmetrical foil on both sides. Equal feel left/right; used on center thruster fins and on quad rears.
• 70/30 — hybrid between flat and 50/50. Loose but with grip in the back third of the fin.
• 80/20 — closer to flat, a little less hold than a true flat. Common in twin-fin templates.
• Inside-foil — the inside face is foiled, not flat. Skatey, drifty, modern fish/twin feel.

Rake is the angle of the fin’s tip relative to the base — how far the tip is "pulled back" from vertical. High-rake fins draw long, drawn-out turns. Low-rake fins (sometimes called "pivot fins") snap the board around tighter.

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High rake vs low rake — at a glance

• High rake (~33°+) — long, smooth carves. Great for point-break trim, big walls, longboards in larger surf.
• Mid rake (~28–32°) — the all-rounder. Most performance shortboard side fins live here.
• Low rake / pivot (<28°) — tight pivot in the pocket. Ideal for steep, hollow waves and traditional logging.

Base is how long the fin is along the board. Depth is how deep the fin goes into the water. The relationship between the two is the trade-off between drive and pivot.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. A wider base typically means more drive — the fin grabs more water and pushes the board forward. A deeper depth means more hold but less looseness.

Quick mental model

• Big base, deep fin — power surfers, points, drawn lines.
• Small base, shallow fin — looser, skatey, slidey.
• Medium base, medium depth — the daily-driver thruster set.

The family is the number and arrangement of fins. Each family has a personality — a default behavior the board takes on regardless of foil and rake.

Each Lundquist model has a fin family that brings out its best — and a couple of alternatives that change the personality without changing the shape. This is a working list; we’ll add per-model recommendations as the catalog fills out.