They are made from sustainable UPF 50+, Water Repellent, 4-Way Stretch, Eco-Friendly performance fabrics and come embedded with an ultra soft mesh liner that ensures proper air circulation so that your skin stays dry at all times. They are even vented, so you never have to worry about dealing with inflated trunks ever again and have a back pocket equipped with an elastic key loop in case you want to go in the ocean for a dip with your keys and not worry about losing them.