Product details:

They looked to the world of ski mountaineering racing where the competitors obsess over weight even more than cyclists do yet their insulation is a matter of survival not merely comfort. And with ski mountaineering being an insanely aerobic sport breathability is paramount. The construction of this jacket is similar to that of an insulated alpine shell with an insulation layer sandwiched between woven inner and outer layers. Unlike most mountain jackets though the woven shell isn't completely windproof instead Castelli left a small amount of permeability. The middle layer is a puffy insulation layer is insanely light specific gravity 0.6g but won't pick up moisture from either sweat or rain. Pliss stretch panels on sides elbows and wrists allow for close-to-body fit yet with full freedom of movement. 3 rear pockets with reflective gusset at bottom. 0-12C 32-54F. Weight 422g.