The F1B Goldendoodle (or backcross) is produced by crossing an F1 Goldendoodle with a Poodle. These dogs will have a higher success rate for non-shedding, and are recommended for families with moderate to severe allergies. Notice that the F1b has a lot more curls and they are tighter curls, more like a Poodle.
The higher generation Labradoodles like the F1B and the Multigeneration Labradoodles are considered to be very low to non-shedding dogs and are truly a great option for families with mild to severe pet allergies.