As the picture shows, extensions come in several diameters, sizes, materials and collors. Here is what I consider before buying:
- RDM or SDM (make sure it fits your mast)
- Alu or carbon (carbon: less weight / more $)
- Max AND Min** length
Here are two extensions that meet my expectations:
* RDM = reduced diameter. Often a bit more expensive but les material means less weight. I find RDM mast just make the sail feel better. If you are not sure here, why not check check 'Recommended Masts' first
**= Is the 0 really the 0? (If the mast doesn't require extension I DON'T want 1 or 2 inch extra useless inches!)