Kitesurfing glossary

Last updated 25 September 2026

Plain-English definitions of the kite terms used across this site. Terms are linked here the first time they appear in a guide.

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Aspect ratio: How long and narrow a kite is: its span squared divided by its area. Higher-aspect kites are more efficient and hold power better at the bottom of their wind range. Lower-aspect kites turn faster, relaunch more easily and feel more forgiving.

Back lines: The two outer lines attached to the ends of the bar and the trailing edge of the kite. Pulling one steers the kite. Pulling both (sheeting in) adds power.
Bar: The bar you hold to steer and power the kite. It carries the depower line, chicken loop and quick release, and it's usually sold in lengths matched to kite sizes.
BKSA: The British Kitesports Association, the UK's governing body for kitesports. It certifies UK instructors and schools, and its membership includes third-party insurance.
Bridle: The lines that connect the flying lines to several points on the kite's leading edge. A bridle spreads the load and shapes the canopy. It affects bar pressure, relaunch and how the kite depowers.

Chicken loop: The loop on the bar's centre line that hooks onto your harness, so your body takes the kite's pull instead of your arms. It contains the primary quick release.
Cross-shore: Wind blowing roughly parallel to the beach. Cross-shore and cross-onshore (angled slightly towards land) are the safest directions for learning, because the wind brings you back towards the shore if something goes wrong.

Depower: Reducing the kite's pull by pushing the bar away (sheeting out) or pulling the trim strap. Both lower the kite's angle of attack. How much a kite depowers decides how comfortable it feels in gusts.
Directional board: A surfboard-style kiteboard with a defined nose and tail, ridden in one direction and gybed to change direction. Used mostly for waves and strapless riding.

Flagging: What a kite does after you trigger the quick release: it flies on a single line like a flag, with almost no power left, so you can recover it or wait for help.
Flatlock seams: Stitching that goes right through the neoprene and lies flat. It's comfortable and durable, but it lets water seep in, so it's used on summer suits.
Foil: A board with a mast and underwater wings that lift the board clear of the water. Foils ride in much lighter wind than twin-tips because there's far less drag.
Front lines: The two central lines that attach to the kite's leading edge and carry most of the load through the chicken loop to your harness.

GBS seams: Glued and blind-stitched: wetsuit panels are glued, then stitched only partway through the neoprene, so water can't get in through the needle holes. It's the standard for suits used in cold water.

Hook knife: A small shielded blade, usually kept in a harness pocket, for cutting tangled lines in an emergency.
Hookless: Riding with the chicken loop off your harness hook, holding the bar directly. Used for freestyle tricks. Hookless harnesses use a rope or webbing instead of a metal hook.

IKO: The International Kiteboarding Organization, which certifies instructors and schools worldwide. IKO certification cards are widely recognised by rental centres abroad.
Impact vest: A foam vest that cushions falls and adds some flotation. Most impact vests aren't certified buoyancy aids, so they aren't a substitute for one where a buoyancy aid is required.

Kiteloop: Looping the kite through the power zone while you're in the air, which pulls you downwind with a big surge of power. Big megaloops are the headline move in big-air riding.
Knots: The usual unit for wind speed. One knot is about 1.15 mph or 1.85 km/h.

Leading edge: The inflatable tube along the front of the kite that gives it shape and makes it float, so you can relaunch from the water.
LEI kite: Leading-edge-inflatable kite: the standard kitesurfing kite, held in shape by an inflatable leading edge and struts. It floats, and it can be relaunched from the water.
Low end: How well a kite (or board) keeps working at the bottom of its wind range. A kite with good low end lets you ride on a smaller size in marginal wind.

Offshore wind: Wind blowing from the land out to sea. It's gusty near the beach and carries a stranded rider away from shore. Don't kite in offshore wind without dedicated rescue cover.
One-pump: An inflation system that links the leading edge and struts, so the whole kite inflates from a single valve.
Onshore wind: Wind blowing straight from the sea onto the beach. It brings you back to land, but it makes launching and getting out through the waves harder, and it can drag you onto the beach.

Power zone: The area of the wind window directly downwind of you, where the kite generates the most pull. Diving the kite through it produces a surge of power.

Quick release: The main safety system on the chicken loop: pushing or pulling it opens the loop, so the kite flags out on one line and loses almost all its power.
Quiver: Your set of kites (or boards) chosen to cover different wind strengths. A common two-kite quiver pairs a larger and a smaller kite about 3–4 m² apart.

Relaunch: Getting a crashed kite back into the air from the water. How easily it relaunches is a big comfort factor for beginners, and for anyone riding in light wind.
Rocker: The curve of a board's bottom from tip to tail. More rocker rides chop more smoothly and suits bigger riders in strong wind. Less rocker planes earlier and is faster upwind.

Safety leash: The leash connecting your harness to the kite's safety line, so the kite stays attached to you after you trigger the quick release, instead of flying away.
Self-rescue: Winding in the lines and using the kite as a sail to get yourself back to shore when you can't relaunch or ride. It's a core skill taught in lessons.
Spreader bar: The metal or composite bar with the hook on the front of a harness. It spreads the kite's pull across the harness.
Struts: The inflatable tubes running from the leading edge towards the back of the kite. More struts make the canopy stiffer and more stable. Fewer struts make the kite lighter, which helps in light wind and for drifting in waves.

Trim strap: The adjuster on the bar's centre line that sets the kite's baseline power. Pull it to depower for gusty or strong conditions.
Twin-tip: A symmetrical kiteboard you can ride in either direction without turning it round. The standard board for learning, freeride and big air.

Wind range: The spread of wind speeds a kite can be ridden in comfortably, from where it starts to work to where it becomes too powerful. Published ranges assume an average rider weight, so adjust for your own.
Wind window: The quarter-sphere downwind of you that the kite can fly in. Power is highest in the centre (the power zone) and lowest at the edges and at the zenith.

Zenith: The point directly above your head at the top of the wind window, where the kite has the least power. It's used as a parking position.