Reliable warmth for your outdoor activities. The Men's Helium Jacket is a super-lightweight insulating jacket. To ensure a high level of comfort Jack Wolfskin have used a premium quality down fill. This ensures optimal insulation performance at a very light weight. The outer fabric stops the wind getting through and helps to protect you against undercooling.The Stow Away function is also very practical. When not needed, simply stow it in its own hip pocket and it takes up very little space in your pack.