Our signature 'Sensible Workout-Shirt': Breezy, backless workout top for a splash of vitamin D. Long sleeves to minimise sun on already tough arm skin. 91.8% Rayon. (Rayon, also called viscose and commercialised in some countries as sabra silk or cactus silk, is a semi-synthetic fibre, made from natural sources of regenerated cellulose, such as wood and related agricultural products. It has the same molecular structure as cellulose.)
