Haleine, a French term, translates to 'Breathe' in English. Our most breathable insulating layer to date, the Haleine Hoody is constructed utilizing Polartec Alpha Direct 90gsm fleece. This piece provides unmatched warmth out of a sub 5oz ultralight design. This is our first choice for UL backpacking / thru-hiking, layering on the coldest of days in the mountains, and days on the trail where an active insulation is needed most.