High-energy and fun, the new Penguin Peak is one your little cubs won't have to grin and bear. Fine-tuned with a performance fit that accounts for growth spurts, this Midweight OTC offers improved calf sizing for kids who won't stop growing. And as if Penguins weren't cool enough, this sock is also thermoregulating - so the hotter their little piggies run, the cooler they'll stay.