On Running Cloudswift 4 ADAlloy | Frost. Small fit, consider one size up. The all-day sneaker with a new water-repellent finish for all your urban adventures. - Even more comfort: Snug fit for maximum comfort and updated technical mesh upper for increased breathability and a contemporary look. - Water-repellent: The water-repellent finish on the upper protects your feet on rainy days, enhancing the shoe's durability and performance. - Differentiated density midsole: Made with a soft top layer of Helion™ superfoam and a denser bottom layer, providing more propulsive take-offs and increased cushioning and bounce with every step.