Dip in. Switch up. Hydrochromic fabric reveals a hidden print when wet, turning these swim trunks into a built-in party trick with serious poolside payoff. Features: Hydrochromic printed fabric Elastic waistband with drawcord Interior mesh lining Garment bag included Composition: 100% Polyester Lining: 80% Polyamide, 20% Elastane Model height is 6'2 (approx. 188cm) and is wearing a size medium. 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.