FLOATING WEEKS

I am rviewing weeks for sale, and I see that 2 are listed as "floatinng (high)" I'm not sure what that means. I can understand a designated week of the year, but please explain "floating".

There are two types of floating weeks at the Charter Club: Floating A and Floating B. Floating A can reserve anytime of the year. Floating B can only reserve between weeks 16-50. With a floating week you have to reserve in advance. There is no guarantee that the week you are requesting is available, especially if it is between weeks 4 -13 which appear to be the most popular.