Disney's Phineas and Ferb 

Agent P Perry the Platypus 3-D Plush Slippers

Kids/Toddler Sizes 

Small 5/6 - about 5.5"

Medium 7/8 - about 6"

Large 9/10 - about 6.5"

Measurement is of the sole of the slipper and was taken from base

Officially Licensed Disney Merchandise