Go Ahead, Get Sweaty. The Swiftly Relaxed Collection Is All About High Performing Fabric That Seamlessly Adapts To You And Your Workout. Designed For Running. A Loose Fit With A Little Extra Room - sits Below The Waistband For Moderate, Everyday Coverage. Silverescent Technology, Powered By X-Static, Inhibits The Growth Of Odour-Causing Bacteria On The Garment.