All of size in our shoes are China size, so please refer to the size in description before you ordered. Synthetic sole Breathable: Hollow Out design, more breathable, favorable foot health. Massage Particles Inside -- Massage footed and quick to dry, more soft and comfortable. Portable: Ultra-Lightweight, which convenient for you to take it on your bag. Anti-slip sole: Lightweight outsole, very soft and can bend, curl. Wear resistance, skid prevention. Multi-Use: Suitable for outdoor activities or house uses, beach entertainment, shower, swimming pool, gym, shopping, garden, bathroom, hotels or just have a walk with dog etc.