Browning Camping brings you the versatile Vortex sleeping bag series This unique hybrid sleeping bag features a top layer filled with hydrophobic down and a bottom layer filled with synthetic TechLoft Micro insulation to ensure a comfortable and warm night's sleep Our TechLoft Micro insulation consists of multiple denier staple-length fibers that have a siliconized finish for maximum insulation loft and compactness It is an ultra-lightweight insulation that has a tremendous weight-to warmth ratio The Vortex uses RDS certified 600-fill hydrophobic down which adds water resistance and prevents the down from clumping The Vortex has No 8 separating zippers and an insulated chest and zipper baffle For durability there is a polyester ripstop outer shell and a soft polyester liner The included compression stuff sack makes packing a breeze The Vortex is offered in multiple temperature options accommodating a variety of hunting and camping seasons The Vortex is a perfect light-weight bag for hiking into base camp or spike camp