【Premium Silicone Material】Made from food-grade silicone, ensuring safety and durability for both adults and children. 【Ergonomic 3D Design】One-piece molding structure with 3D human head shape and ear protection design for maximum comfort. 【High Elasticity】Highly elastic and soft silicone material easily stretches and quickly returns to its original shape. 【Enhanced Water Protection】Double-layer waterproof design around the ear edges for superior water resistance. 【Hair Protection】Internal vertical texture design effectively prevents hair pulling and keeps hair neat. 【Durable Construction】Strong elasticity, toughness, and weather resistance, maintaining shape in both cold and hot conditions. Specifications: Material: silicone For reference: Head circumference 50-58cm: loose Head circumference 54-58cm: not tight Head circumference 60cm and above: tight