Slim, Trim, and Tone with the SaunaFx Men's Short. Neoprene material helps to increase the body’s core temperature, helping to improve the results of your exercise routine, shed excess water weight, and allow you to maintain muscle warmth during athletic activity. . Built in Microban® antimicrobial product technology inhibits the growth of stain and odor causing bacteria on the neoprene, keeping your items cleaner and easing the cleaning process for the life of your product.