B 31 sails
Every sail for the B 31 on one page. Instant estimates on racing sails, cruising sails by quote, and the upgrades that matter offshore. All sized to the B 31 rig.
Fixed price. Add to cart.
Made to measure for the B 31 in named Dimension-Polyant cloth. Pick the cloth and options, check out, and we confirm your measurements before anything is cut.
Also sized to your rig
Who's making your sail
Real sailors.
A real loft in Geelong.
Every Kraken sail is designed from your boat’s own measurements by a designer who still races at international level, and built in cloth made in Europe or America. Before anything is cut, Christie or Ryan checks your numbers and talks to you about how you sail your B 31. That conversation is where a good sail becomes the right one.
Questions about the B 31? Email sales@krakensails.com and you’ll hear back from one of us, not a call centre. Read our story
Rudder Cup 2026
Toecutter, on Kraken sails, wins AMS and PHS in Australia’s oldest ocean race.
Sailing with Phoenix
Oregon to Hawaii singlehanded. On day 11 the rudder went and the sails flogged for four hours in 25 knots. “The sails held.” Read the story
Build a Racing Wardrobe
Instant estimate, full quote in 3 business days. Sized from the rated sail areas of real B 31s. Configure the wardrobe and see the estimate straight away. A sailmaker then sends your full quote and sail plan.
| Sail | PX film | Carbon Sport | Membrane |
|---|---|---|---|
| Mainsail15.9 m², pin head | A$3,383 | A$4,021 | A$5,429 |
| J1Light air genoa | A$3,042 | A$3,735 | A$5,104 |
| J3Heavy air jib | A$2,706 | A$3,025 | A$4,285 |
| Code zeroDimension-Polyant CZ | A$4,450 | ||
| Symmetric57.7 m² | A$3,135 |
From prices, inshore cloth, one reef on the main. Kites in Nylite; the A2 in Superkote is shown in the Carbon Sport column. A$ including GST.
- 1Choose inshore or offshore and your cloth.
- 2Add the sails you need and see the estimate.
- 3Get sent your quote and sail plan.
Racing sails are quoted, not bought online, so a sailmaker checks the rig and your racing before anything is built. Two-year warranty on racing sails.
B 31 racing sail prices
Typical prices for the B 31, sized from the rated sail areas of real boats. Your exact price follows the rig check.
Inshore racing
| Sail | Value · PX Liteskin | Performance · Carbon Sport film | Grand Prix · Membrane, film faces |
|---|---|---|---|
| Mainsail | A$3,383 / US$1,995 | A$4,021 / US$2,370 | A$5,429 / US$3,210 |
| J1 headsail | A$3,042 / US$1,800 | A$3,735 / US$2,200 | A$5,104 / US$3,020 |
| J2 headsail | A$2,915 / US$1,725 | A$3,575 / US$2,110 | A$4,923 / US$2,915 |
| J3 headsail | A$2,706 / US$1,600 | A$3,025 / US$1,785 | A$4,285 / US$2,540 |
Coastal & offshore racing
| Sail | Value · PX taffeta | Performance · Carbon Sport Liteskin | Grand Prix · Membrane, non-woven faces |
|---|---|---|---|
| Mainsail | A$3,553 / US$2,095 | A$4,939 / US$2,905 | A$6,188 / US$3,655 |
| J1 headsail | A$2,998 / US$1,775 | A$4,406 / US$2,595 | A$5,544 / US$3,280 |
| J2 headsail | A$2,877 / US$1,700 | A$4,213 / US$2,485 | A$5,341 / US$3,160 |
| J3 headsail | A$2,673 / US$1,585 | A$3,553 / US$2,095 | A$4,626 / US$2,740 |
Downwind and reaching
| Sail | Cloth | Typical price |
|---|---|---|
| Symmetric spinnaker (58 m²) | Nylite | A$3,135 / US$1,855 |
| Symmetric spinnaker (58 m²) | Superkote | A$4,439 / US$2,615 |
| Code zero | CZ | A$4,450 / US$2,620 |
| Code zero | CZ GP | A$5,968 / US$3,510 |
A$ prices include GST. As a proudly Australian company we keep our tax here, and Australian businesses paying their tax help support Australian sport. US$ prices are before local taxes and duties.
Sails for the long way round.
Passage making asks more of a sail: weeks on the boom, sun and chafe, and a third reef when it blows. Here is how the B 31 wardrobe changes when you leave the coast.
Optimum Cruise
Dimension-Polyant's cruising Dacron and our best value.
- Mainsail
- Price on request
- Genoa 130%
- Price on request
C-Breeze
Tighter weave of higher tenacity fibres. Resists stretch and lasts longer.
- Mainsail
- Price on request
- Genoa 130%
- Price on request
Hydranet Radial
Dimension-Polyant's offshore cloth, woven with Dyneema, with panels that follow the loads. Built for ocean miles.
- Mainsail
- Price on request
- Genoa 130%
- Price on request
Hydranet and offshore builds go through a short quote so we can talk through your passage. Catalogue sails carry a 12-month warranty; custom and racing sails carry two years.
B 31 rig
These are the published rig dimensions. Boats change over the years, so we check your own measurements before we build, and tell you before design starts if a change moves the price.
| Mainsail luff (P) | 9.70 m |
|---|---|
| Mainsail foot (E) | 2.80 m |
| Fore triangle height (I) | 10.80 m |
| Fore triangle base (J) | 3.50 m |
| Length overall | 9.45 m |
| Rig | Masthead sloop |
Questions about B 31 sails
Can I race in cruising sails?
Yes, plenty of club racers do. If results matter, a laminate main and headsails hold their shape far longer: open the configurator to compare.
How long does it take?
Cruising sails take about 4 weeks to build, then ship express. Racing laminates take about 4 weeks and membranes about 6 once the design is signed off.
Do the prices include GST and shipping?
A$ prices include GST. US$ prices are before local taxes and duties. Shipping is added at checkout: A$75 in Australia, about US$75 plus duty prepaid to the US.
A$ prices include GST. As a proudly Australian company we keep our tax here, and Australian businesses paying their tax help support Australian sport. US$ prices are before local taxes and duties.