Andrew Christian Men's Flashback Basic Trunk 80% Nylon/20% Spandex Machine wash Add up to 1 inch (2.5 cm) onto your current buttocks measurement Completely invisible support structure Utilizes new fiber technology using sport upf 50 fade resistant fabric for a body-hugging fit and quick-drying characteristics; 80% nylon / 20% spandex Lifting mechanism is super comfortable... like wearing a jock strap Made in the andrew christian design studio in los angeles, ca, usa