If this is question that has confused you for years, then make sure you check out these clips from Loft sails as the incredible sail designer Monty Spindler explains all.

Spindler has been a man of the ocean since the age of six years old and he spent his whole life dedicated to making the ultimate sails. His drive to create perfection saw him work with many sail brands until he opened the Loft in 1998. Loft is now producing race and test winning sails and they are dedicated to their philosophy of 'maximising the wind range of their sails whilst reducing the number of sails lines presented to the market'.

2011 has been a spectacular season for Loft as they have seen their team riders charge to the top of the results tables. Let Spindler share his award winning knowledge and help you make your future decisions about masts and battens a whole lot easier.

For the RDM vs SDM debate click