Three families, and they are not three price points for the same thing. Each solved a problem the last one had and brought a new one of its own. You choose the material direction; the configurator uses the boat, mainsail type, Usage, Build Standard and dimensions to show the cloths and constructions that are valid for this sail.
The three families
| Dacron | Woven polyester. Durable, tolerates folding and rough handling, inspectable by eye, repairable almost anywhere. Stretches more than the others, and more as it ages |
| Laminate | A stretch-resistant film, load-bearing fibres, and usually a woven face for protection. Holds its designed shape far better and weighs less. Dislikes being folded in the same place repeatedly, and wants inspecting for delamination |
| SurgeX | Continuous fibre laid along the load paths of your particular sail rather than cut from a roll. Best shape retention, lightest for its strength, structure and sail designed together |
How each is actually made is in Upwind & Code Zero Sailcloth. The available families, mills and weights are listed in Sailcloth.
Which one
Start from how the boat is actually sailed, not from what sounds best.
Dacron if the sail’s job is to last, be easy to handle and be repairable anywhere. This covers most cruising mainsails and is not a compromise choice.
Laminate if you notice the difference between a sail that holds its shape and one that does not, and you will fold it properly and check it periodically.
SurgeX if shape retention and weight are what you are buying.
Weight
Heavier is not better. Too light for the sail and it stretches out of shape early; too heavy and it is dead weight aloft, harder to handle, and no longer-lived for it.
For Dacron this is not a judgement call — the cloth manufacturers publish recommendation tables and the weight is read from them for your sail’s size.
All three families are current-production cloth from established manufacturers. You will see them under our own names, chosen so the description tells you what the cloth is for rather than which mill it came off.
Construction follows the cloth
A woven cloth is engineered to be strongest in a particular direction, and the way the sail is panelled has to put that direction where the loads are. This is why a given cloth is cut one way and not the other, and why Cross-Cut and Radial are not always two interchangeable choices. The full explanation is in Cross-Cut and Radial-Cut.
For SurgeX the question does not arise in the same form, because there are no panels carrying the primary loads — the fibre itself follows the load paths.
Construction matters, but it is derived from the selected cloth rather than exposed as a manual configurator choice. Radial-compatible laminate uses a tri-radial layout; woven and other non-radial cloth uses cross-cut. For radial sails, the preview also calculates panel density automatically from foot length at approximately one panel per 600 mm.
What the cloth decides without being asked
How the sail is cut. Woven cloth is strongest along one direction and the panel layout has to match — Cross-Cut and Radial-Cut.
Which hardware is used. A ring that concentrates load into a small area suits a woven Dacron and is wrong in a laminate, so the fitting at the reef clew follows the cloth.
How it should be stowed. A Dacron main can be flaked and left. A laminate wants flaking in different places over time rather than folding on the same lines all season.
Reinforcement geometry. How far a corner patch has to extend before the load has spread into the body of the sail depends on how the cloth distributes load. Lower-stretch cloth needs the transition managed more carefully, not less.
Batten pockets. The pocket has to contain the batten and manage the local wear and distortion around it, and how it is built depends on what it is built in.
Build Standard is applied on top
Build Standard is applied on top of the cloth decision, not instead of it. Heavy-Duty increases reinforcement, taping, stitching and hardware where the sail’s loads and expected service justify it.
It describes construction. It is not a sailing-area certification, and it is not a general upgrade — the extra material is weight, carried high, and on a sail that does not need it that is a cost rather than a benefit.
Configuring this at SurgeSails
Range selects the family and Cloth offers the weights or grades available for a sail of your size. The valid Cross-Cut or Tri-Radial construction and radial panel density then follow automatically. There is no manual cut-style or radial-division selector. Older saved seam-mode values may still be read for migration, but they do not override the current preview or build specification.
SurgeX opens two more: Fiber Material and DuraSkin with its colour. DuraSkin is not decoration — it is what stands between the fibre structure and ultraviolet, chafe and handling.
Thread, stitch rows, tape widths, fibre density and plot layout are not configurable. They are determined by the cloth, the sail’s size and the Build Standard, then confirmed in Sailmaker Review.