I have Ultras in 12, 10, 9( will sell), 8, and looking at getting a 6m . The addition of a 10m this year has evened out the sizing, didn't like the jump from 12 to 9 last year. I use for foiling only. I have tried Cloud C2, LF Solo v1, Notus Air v1 and Reo's - the Ultra suits me best . Highly resist...