The short version
- Choose a leash about as long as your board, or slightly longer. Thin "comp" leashes are for proficient surfers on shortboards; beginners and big waves call for a thicker regular leash.
- Fin size follows body weight. On the FCS chart, medium fins cover roughly 143–176 lb.
- FCS II and Futures fin boxes aren't interchangeable. Check your board before you buy fins.
- Pick wax by water temperature, lay down a harder base coat first, and re-texture it with a wax comb instead of piling on more.
- A leash is not a life jacket. Leashes break, so never paddle out farther than you can swim.
Most surfers spend their money on the board and then grab whatever leash, fins and wax are by the register. That's backwards. These three small items decide whether your board stays with you after a wipeout, whether it holds a line or spins out, and whether your feet stay planted when you pop up. The right choices are cheap, and the wrong ones cost you waves. Here is how to get each one right.
Surf leashes: length, thickness and cuffs
A leash keeps your board from turning into a hazard for everyone inshore of you, and it saves you a long swim. The core rule from evo's leash guide is simple: a leash should be equal in length to or slightly longer than the board it's used on. Leash lengths run from about 4' for grom boards up to 12' for longboards and SUPs.
- Too short and the board can spring back at you or yank you onto it when the cord snaps taut.
- Too long and you get more drag, more tangles, and a bigger "bail radius," meaning the board can reach other surfers.
- Between sizes? Round up. Some beginners go a full foot longer for extra margin, but that bigger radius is a real cost in a crowded lineup.
| Board | Typical leash length | Thickness | Cuff |
|---|---|---|---|
| Shortboard, 5'6"–6'4" | 6' | Comp (thin) for proficient surfers; regular for beginners | Ankle |
| Fish, hybrid, funboard, 6'6"–7'6" | 7' | Regular | Ankle |
| Mid-length, 7'6"–8'6" | 8' | Regular | Ankle or calf |
| Longboard, 9'+ | 9'–10' | Regular or heavy | Calf/knee (best for walking the board) |
| Soft-top beginner board, 7'–9' | Match board length | Regular | Ankle |
| Bigger waves on any board | Board length or a little longer | Heavy/big-wave | Ankle |
Comp vs regular thickness
Comp leashes are around 3/16" (about 4.7 mm) thick. They're lighter, have less drag and tangle less, and evo considers them fine for a proficient surfer on a board under 7' in most conditions. Regular leashes, at roughly 5/16" (about 8 mm), are more durable and are what beginners and big-wave surfers should use. When in doubt, go thicker. The drag penalty is small, and a snapped leash is a big problem.
Ankle vs calf cuffs, swivels and rail savers
- Ankle cuffs are standard and the easiest to pull your board back with, but they tangle a little more.
- Calf (knee) cuffs sit just below the knee, keep the cord off the deck while you cross-step on a longboard, and tangle less.
- Swivels at the cuff (and sometimes at the rail end too) stop the cord from twisting and wrapping around your feet.
- The rail saver is the strap between the cord and the leash plug. It spreads the load so a hard wipeout doesn't let the cord slice through your tail. Attach it so it sits just past the rail with no slack inside the plug loop.
Inspect your leash before every session for nicks in the cord, frayed Velcro and a worn leash string. Replace it at the first sign of damage. Most leashes fail at the string or the rail saver. Leashes break even when they look fine, so never paddle out farther than you can comfortably swim back.
Fins: setups, sizes and boxes
Fins are the steering and the drive of your board. Change them and the same board can feel looser, faster or more locked in.
Common setups
- Single fin: Classic longboard setup. Smooth, drawn-out turns and great trim for noseriding.
- 2+1: A center fin with two small side bites. Common on mid-lengths and modern longboards for a bit more bite in the turn.
- Twin: Fast and skatey. Popular on fish and retro shapes in small, mushy waves.
- Thruster (three fins): The all-round standard for shortboards and most soft-tops. Predictable and controlled.
- Quad: Speed and drive down the line and good hold in hollow waves. A popular swap on five-fin boards.
What the fin terms mean
- Base: Length where the fin meets the board. More base means more drive.
- Depth: How far the fin reaches into the water. More depth means more hold.
- Sweep (rake): How far the fin leans back. More sweep gives longer, drawn-out turns. Less sweep gives a tighter pivot.
- Flex: Stiff fins respond instantly. Flexible fins feel forgiving and snappy out of turns.
- Cant and foil: Cant is the side fins' tilt outward. More cant is more maneuverable. Foil is the fin's cross-section shape, which affects how water flows over it.
Fin size by rider weight
Fin makers size fin sets by body weight, because heavier surfers need more area for the same hold. FCS's chart, as published by SurferToday, is the most widely used reference:
| FCS size | Rider weight |
|---|---|
| XS | Under 55 kg (about 121 lb) |
| S | 55–70 kg (about 121–154 lb) |
| M | 65–80 kg (about 143–176 lb) |
| L | 75–90 kg (about 165–198 lb) |
| XL | Over 85 kg (about 187 lb) |
The ranges overlap. In the overlap, size down for a looser, more pivoty feel in small surf and size up for more hold in bigger, more powerful waves.
Fin box systems
Before buying fins, check what box your board uses. The two dominant systems are FCS II, which is keyless and snaps fins in with a spring lock, and Futures, a single long base held with a set screw. Their fins are not interchangeable, so a Futures fin will not go into an FCS II box. Longboards and many soft-tops use a single long "US box" for the center fin, with a screw and plate. Bring a key or small screwdriver in your car kit, and rinse sand out of the boxes after a session so fins seat fully.
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Surf wax: temperature, base coat and application
Wax gives your feet grip on a slick deck. It comes in formulas matched to water temperature. Warmer water needs harder wax so it doesn't go soft and smear. Colder water needs softer wax that stays tacky. Exact ranges vary by brand, so read the label. Sticky Bumps, as listed by one retailer, gives these ranges:
| Formula | Water temperature (Sticky Bumps) |
|---|---|
| Tropical | Above 75°F / 24°C |
| Warm | About 64–74°F / 18–23°C |
| Cool | 58–68°F / 14–19°C |
| Cold | Below 60°F / 15°C |
| Base coat | All temperatures (harder first layer) |
The ranges overlap at the edges. If the water sits right on a boundary, choose the warmer formula on hot, sunny days and the colder one on overcast days.
How to wax a board
- Start clean and dry. A brand-new board or a freshly stripped deck is ideal. Work in the shade so the wax doesn't melt.
- Lay down base coat. Use the edge of the bar with light pressure in small circles, a crosshatch, or straight lines in two directions. You're building small bumps, not a smooth layer. Cover the area from the tail pad (or tail) up to roughly where your chest lies when you paddle. On longboards, wax the whole deck, because you'll walk it.
- Add a top coat. Apply the temperature-specific wax over the base with light circles. The bumps you built will grab it.
- Re-texture, don't re-pile. Before each session, drag a wax comb diagonally across the deck in a crosshatch to rough up the old wax, then add a few light strokes of top coat.
Leave your board in the sun for a few minutes and the wax softens enough to scrape off in clean strips with the flat edge of a wax comb. Finish with a rag and a little coconut oil or a wax remover. Strip and re-wax whenever the deck turns grey, slick or gritty with sand. And never leave a board in a hot car. Wax melts, and the heat can damage the board too.
Small gear for soft-tops and beginner boards
If you surf a foam board, you need far less wax, because the textured deck already grips. A light coat helps once the deck gets slick, but use the softest formula for your water temperature and expect it to wear quickly. Beginner soft-tops usually come with flexible plastic thruster fins. They're safer in a crowded beginner zone, and they're a sensible place to stay until you can trim along a wave face. Our soft-top guide explains why.
A traction pad on the tail is optional on a shortboard but useful: it gives your back foot a clear reference point and a kick to push against. It replaces wax on that part of the deck.
A simple pre-session checklist
- Leash: cord, cuff Velcro, swivel and leash string are all intact, and the rail saver sits just past the rail.
- Fins: fully seated and tight. Run a finger along the edges for cracks or sharp chips.
- Wax: combed and freshly topped up for today's water temperature.
- Conditions: checked against the forecast, with a lineup that suits your level and the etiquette to match.
- Body: the right wetsuit or rash guard for the water temperature (see our wetsuit temperature guide).
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FAQ
Which foot does the leash go on?
Your back foot. If you ride regular (left foot forward), the leash goes on your right ankle. If you ride goofy, it goes on your left.
How often should I replace a surf leash?
Replace it when it shows any damage: nicks or flattened spots in the cord, Velcro that no longer holds, a corroded swivel, or a frayed leash string. Heavy sun exposure also weakens the cord over time, so store it out of the sun.
Can I put Futures fins in an FCS II board?
No. The two systems use different base shapes and aren't interchangeable. Buy fins that match the boxes on your board.
Do I need base coat?
It isn't mandatory, but a harder base coat makes the bumps last longer and gives the softer top coat something to grip, so you use less wax overall. It's especially useful in warm water.