Product size: length 20.6 cm, width 18 cm. PREMIUM ELASTIC SILICONE SWIM CAP - Our children's swimming caps are made of the highest quality silicone. Although stretchy, it is durable enough not to tear or deform easily even after months of normal use. The materials used are also odorless, non-toxic and hypoallergenic, making them safe for children with sensitive skin. Swim caps for boys and girls are comfortable to use - we've put a lot of thought into it to the design of swimming caps for children. Children's swimming caps are designed according to the average size of a child's skull. This ensures a perfect fit - allowing for better fluid dynamics - without compromising comfort. Children's Swim Caps for Boys and Girls - Our styles of silicone swim caps are designed to be worn by children. boys and girls. As a girls swimming cap, it is stretchy enough for girls with long hair and easy to shrink for boys. Whether in the ocean or in the pool, our swim caps for kids will keep your hair tangled while swimming. Chlorine and bacteria resistant silicone swim caps - With our swim caps , children can avoid overexposure to chlorine and bacteria in the water. The snug fit prevents water from entering the hair and ears. The part that touches the ears is also ergonomic, allowing optimal contact between the swimming cap and the ears, thus avoiding irritation of the ears by rubbing against the rubber.