Cavachons are low to non shedding. Most have a Bichon Frise coat which, in a purebred, does not shed, but since one of their parents is a Cavalier, they can have a somewhat shedding coat. F1s typically have the non shedding coat. (Bichon Frise with Cavalier King Charles Spaniel) F2s are said to lose their non shedding coat (Cavachon with Cavachon)
Luckily not Cavachons do not shed which also means they are hypoallergenic!