The Samos swim trunk features hydrochromic technology, which reveals a hidden Bunny pattern when the shorts come in contact with water. Mesh lining and a drawstring-stretch waistband allow for next-level comfort. Waterproof bag included in back pocket.Also available for MenWoven - 100% Polyester mechanical stretch, inside net 76% polyamide, 24% elastaneMade in ChinaRegular fitHydrochromicSilicone Bunny patchMesh liningThree pockets 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.