The beta jacket was created to ensure perfect thermal balance in different climatic conditions built with windstopper fabric xfree 210 beta is able by itself to keep you warm as low as 5176c as if you were wearing jersey and jacket but it feels incredibly breathable and light enough to be suitable for temperatures up to 18176c extremely versatile beta will also offer protection from wind and rain thanks to the windstopper membrane a garment so complete you won39t need anything