Runderwear Running Briefs - AW17 Runderwear Fabric - Lightweight and durable with consistent fabric return. 360 Degree Seamless Technology - Eliminates chafing and subsequent irritation. Ergonomically Designed - To move with the body. Moisture Management - Wicks sweat away from the body keeping you comfortable and dry. Micro-perforations - Allow air to permeate the exterior providing breathability.