GO WILDThe Big Agnes Spike Lake 14 is a traditionally insulated bag designed without the integrated pad sleeve found on other Big Agnes System bags. It was designed to decrease weight and size, while increasing thermal value using the traditional mummy shape. Traditionally insulated bags designed without the integrated pad sleeve found on Big Agnes System bagsDesigned to decrease weight and size, while increasing thermal value using the traditional mummy shapeContoured hood features a draw cord and cord lock for easy adjustment65/165cm YKK #8 zipper - regular and long bagsLiner loopsMate together left and right zip bagsMesh storage sack & nylon stuff sackTECH SPECSProduct weight: 1247 g Operation Temperature Range: 11 to 20 Fahrenheir Insulation: 600 Fill Goose Down Lining Material: Nylon Taffeta