Traverse Synthetic Sleeping Bag (-4°C & -10°C)The Traverse transitions easily into warmer weather with a full length left side zipper, a half length right side zipper, and a foot box zipper that provide unparalleled ventilation or allow the Traverse to be opened completely flat like a comforter. In colder weather, the unique WaveLoft construction allows the Thermolite insulation to expand out into air trapping curves for maximum warmth. Whatever the season, the wider mummy cut of the Traverse