Unisex O Fit Insole Plus Thermal Medium Arch Color:Green Top layer features 50 degree rated synthetic 210000059419 Top layer features 50 degree rated synthetic insulation for versatile use in warmer weatherMid layer features 30 degree rated synthetic insulation for cool nights in the outdoorsThe two layers can be paired to get a 15 degree bag for maximum versatilityZippers open from the bottom to allow for extra ventilationWatch pocket includedRectangular shape is super roomy for a super comfortable experienceComfortable fleece lining on the mid layer is super soft and makes you want to slide right into the bag The Tiger Wall UL makes tent life easy with weight savings for gram counters in mind for your three season adventures Our anatomically designed trim to fit thermal insole maximizes stability and support while reducing heat loss to keep your feet happy on and off the trail when the temperatures drop