Flexible, Breathable and Lighter than ever. Our High Performance Training T-Shirt is advanced activewear for Gym Goers to Joggers, Weight lifters to Walkers.  *BRAND NEW* Light Performance Fabric Breathable material on back panel - See Product Image.  Dri-Fit Fabric Wicks Sweat Away From The Body Oddballs Branding & Design 100% Polyester Hand made in Newcastle, UK Fully Sublimated Design Care: Give it to your mum OR machine wash at 30 degrees Chest size is measured by the circumference of the widest part of your upper torso, below the arms. An accurate chest (or waist!!) measurement is important before ordering.