100% polyester, imported, machine washable Premium Material- 100% high quality polyester, quick drying, breathable, light, comfortable, skin friendly fabric. Change Swimming Trunks- Swimming trunks shorts will change color in warm water, not because of moisture, but because of the temperature of the water. Take it to the beach, pool, party and even the gym. Make your friends envious. (Our color-changing shorts are Asian size, please refer to the size chart when purchasing, it is recommended to buy shorts one size larger) PERFECT DESIGN- These perfect washed twill temperature sensitive color changing slacks have a mesh lining that covers the elastic waistband and drawstring for a better fit, and the two side pockets expand to accommodate your phone or small accessories. MEN'S TEMPERATURE SENSITIVE CHANGING CHANGE SWIM PANTS- Our color changing shorts change color with temperature (86) and humidity. 2022 New Color Changing Beach Shorts- Great for summer beach, surfing, running, walking, pool party, casual wear and vacation.