When running in winter with uncertain weather, what you need is a balance between protection and breathability: don't let cold or humidity affect your performance, and at the same time prevent your body from overheating. The UYN CORESHELL vest is the most advanced solution ever made. Its principle is simple: it protects the front, like a softshell, and lets your back breathe, like a shirt. To give you insulation where you need it, we have introduced our bodymapped BUFFERCONE technology in the inner layer. Buffercone represents a revolution: it retains body heat in areas subject to cooling and creates an insulating cushion. For an extra touch of protection against wind and light rain, we have used the exclusive MEMBRAIN115 membrane on the front, characterized by a very high extension capacity.