The Aero Brief is the first hybrid experience; a synergy of the traditional boxer short and our classic boxer brief. It features limitless vertical scalloping and a patented gusset to support you during fluid & dynamic movements. Aero Brief glides effortlessly across the thighs without friction. Fit suggestion & Gallery model: Aero is designed to stretch and form to your unique physiology. We recommend staying true to size as fabric & scallop design allow for adequate space. The model - is 5'9 175lbs with a 30" waist. He is wearing size M in the photos above. Care instructions & Composition: Standard - Cold wash 30-40°C or 85-105°F and use mild detergent and gentle tumble. Optimal longevity: gently hand wash in cold 30-40°C, and air-dry overnight. Stealthskyn™ is patent pending and is a proprietary synthesis of naturally occurring and synthetic nanofibers of 85% polyester/biosynthetic and 15% lycra/elastine For additional information please visit our FAQ section in the side menu or email us at support@aswemove.com.