The 2021 mens Descente i2 SIO Hybrid Down jacket is a stylish, highly technical and very warm jacket. The jacket is 20K waterproof and breathable. To increase the efficiency of the jacket there are fewer panels and fewer seams, reducing the risk of water penetration and giving greater freedom of movement. The down insulation is mixed with a synthetic insulation thereby reducing the bulk of a pure down jacket. The jacket is a regular fit and has the Descente Heat Navi System which was developed by Descente to convert infrared rays from sunlight into stored heat even in adverse conditions. The Boa system is a simple closure system that can be adjusted quickly to provide maximum comfort with just one turn of the dial.