The Electron Pro has been designed to offer alpinists and winter mountaineers an ultra-warm down jacket without the bulk. Its built with a mix of micro and midi baffles,body-mappedto give you more warmth or mobility where its needed. It has a water- and wind-resistantPertex Quantum Proouter to cope with snow and spindrift, and its filled with 800FP down providing excellent warmth for weight.