Amazing! Awesome! Excellent! First and foremost, they are truly non-slip and even have a textured surface BOTH on the outside and inside, so the foot does not slip! My child has been wearing them since they started walking in the bathroom to avoid slipping (we have a shower), but also outside when we go to the park where there might be mud, etc. From the beginning, they fit very well, and in fact, my child would even ask for them to stabilize their walking at first. We have two other pairs from Biomecanics (one sneaker type and one closed sandal), all PERFECT! I highly recommend them, follow the size guide and get one size up if you want them to last a bit longer.