It means I changed float from 6 degrees to 2 degrees.
As you might know, There are 3 kind of cleats.
Float: (yellow) 6 deg,(blue) 2 deg, (red) 0 deg.
so, yellow one is for bigger. red one is for expert.
I used this yellow cleats for one year and 3 mouth.
This is user’s manual of SPD-SL Pedals
My shoe and new cleat!!