Vibram Performance Rubber Sole with Individual Toe Pockets Helps Strengthen Muscles in Your Feet and Lower Legs, Improving Balance, Agility, Motion and Posture Protects Feet From Hot Surfaces and Rugged Terrain Thin Razor-Siped Soles add Flexibility along with Slip Resistance Machine Washable - Air Dry A Few Uses For KSO: Fitness, Running, Water Sports, Yoga, Pilates, Travel, Trekking and After Sports for Strengthening Muscles in Feet