Short answer: the North Midi is a mid-length foil board — long and narrow instead of short and wide — built to paddle up and pump onto foil early for light-wind winging, downwind and foil-assist. It comes in six sizes from 44 L (5'0") to 96 L (6'4"), and North sizes it three ways: by prone-surf rider weight, by intermediate-to-advanced wing rider weight, and by foil-assist rider weight. The chart is below; the 70 L 5'8" and 82 L 6'0" are the sizes most wingers end up on.
Sizes, volumes and North's rider weights
| Midi size | Volume | Width | Thickness | Prone surf rider | Int–adv wing rider | Foil-assist rider |
|---|---|---|---|---|---|---|
| 5'0" | 44 L | 18 in | 3⅞ in | under 85 kg (187 lb) | — | 75 kg (165 lb) |
| 5'2" | 52 L | 18½ in | 4¼ in | over 95 kg (209 lb) | — | 85 kg (187 lb) |
| 5'4" | 60 L | 19 in | 4⅝ in | — | — | 95 kg (209 lb) |
| 5'8" | 70 L | 19½ in | 5 in | — | under 60 kg (132 lb) | 100 kg (220 lb) |
| 6'0" | 82 L | 20 in | 5⅜ in | — | under 70 kg (154 lb) | 100 kg and up |
| 6'4" | 96 L | 21 in | 5¾ in | — | over 80 kg (176 lb) | novice |
Three things stand out. First, the Midi is narrow: 18 to 21 inches against the 22 to 29 inches of a Seek. Width is what you give up for the long waterline that gets a mid-length moving before the foil lifts. Second, the wing-rider column starts at the 70 L and runs to riders over 80 kg on the 96 L — North does not put wingers on the 44–60 L sizes, which are prone and foil-assist boards. Third, the foil-assist column runs the other way: a motor makes up for volume, so a 100 kg rider is fine on 70 L.
Midi vs Midi Pro
| Midi 2025 | Midi Pro 2027 | |
|---|---|---|
| Construction | Full carbon PVC sandwich, E-glass foil-mount reinforcement | 100% carbon, full PVC wrap over EPS, Foil Drive signal window |
| Sizes | 5'0" to 6'4" (44–96 L) | 5'3" to 6'9", seven sizes |
| North's dials | not published | Stability 3, Early takeoff 5, Manoeuvrability 4, Top speed 3 |
| In the box | EVA deck pad, leash plug, DropBox screw pack (M8 × 30 + T-nuts) | Titanium DropBox screw pack, board bag |
| Vent | GORE two-way, factory fitted | — |
The Midi Pro is the 2027 step up: a progressive centre-V hull, a 5/5 for early takeoff, a longer size run that reaches 6'9", and a 2.4 GHz window in the deck so a Foil Drive remote keeps its signal. It does not publish a volume chart in the data we hold yet, so if you need a number to size by, the 2025 Midi chart above is the one to use. Both boards use the 90 mm DropBox track and ship with the mounting hardware; straps are separate on both.
Honest limit: a mid-length is a specialist shape. It is the right board for light wind, downwind runs and flat-water pumping, where the long waterline earns its keep. It is the wrong board for a first wing session — the narrow deck is harder to balance on than a Seek, and the 96 L 6'4" is the only size North marks as novice. Learn on a Seek or Seek Air, then add a Midi when the light days are the ones you are missing. The downwind-only Horizon, by comparison, runs 95 to 125 L in a narrower 17½–19 inch displacement hull.
What it costs
As of this post the 2025 Midi is on clearance at 20% off: $1,231 (5'0") to $1,519 (6'4"), every size in stock. The 2027 Midi Pro is listed on the product page in 5'9" to 6'9". Orders over $100 ship free in the US, and a board with a wing and a harness or wetsuit takes 10% off as a bundle.
FAQ
What size Midi for an 80 kg winger?
The 96 L 6'4" if you are intermediate; North's chart lists the 82 L 6'0" for wing riders under 70 kg and the 6'4" for over 80 kg. An advanced 80 kg rider who sinks a board happily can go 6'0".
Is the Midi good for beginners?
Only the 6'4". North marks that size novice for foil-assist and puts no wing rider under 60 kg on anything smaller than 70 L. A Seek is the easier first board.
Does a Midi need a different foil?
No. Any 90 mm-track mast fits the DropBox. For light-wind winging on a mid-length, a bigger front wing (North's MA1050v2 and up for most adults) does more for early lift than the board does.
Volume rules are on the wing sizing page; the gear advisor will size you from weight and level.