The quick-dry Samos swim trunk is crafted with hydrochromic technology, which reveals a Bunny pattern on the fabric when it is wet. Waterproof bag in back pocket.100% polyesterQuick-drying fabricMesh liningDrawstring at elastic waistbandThree pocketsSilicone Bunny patch at front Hydrochromic is a term used to describe a type of material that changes color when exposed to water. In the context of swim trunks, hydrochromic materials are used to create a unique and dynamic look. When the trunks come into contact with water, the material changes color, revealing a hidden design or pattern. The color change is temporary and returns to its original state once the fabric dries.