The Burton Men's AK 2L Gore Tex Down Jacket is a lightweight, toasty warm down jacket equipped with the legendary waterproofing of a Gore Tex 2 layer membrane. Stuffed with 800 fill down insulation, the LZ traps fiery heat on sub zero days with its high loft down clusters. Super light and packable, down insulation offers exceptional warmth to weight for maximum thermal performance, even in the coldest conditions. Because down insulation is compromised when it's wet, the jacket's Gore Tex membrane and fully taped seams act as an impenetrable fortress against outside moisture, ensuring the down retains its heat trapping loft. Add in quilted down proof lining for equal distribution of warmth without the clusters migrating or clumping together.