Hi there, the majority of our riders use the Duotone sails, this is pretty similar at other board/sail brand combinations as it´s more efficient in terms of marketing and R&D etc. But generally our boards work quite well with a variety of sails, I have used NP sails a nr of times on our boards and they feel very good too, as do P7, Loft, Gaastra etc. There are only a few products on the market which are 100% tuned to work in combination with each other, these are mainly niche brands.