Highlander echo sleeping bag description the echo 250 is designed for colder climes the bag is filled with 250gm synthetic hollow fibre which is feather shaped providing the bag with additional loft without adding weight features include a 3d neck baffle cowl hood and foot box offering extra protection and comfort ideal for those camping in the winter or cooler climates features warm and very comfortable soft inner fabrics 2 way anti snag zip full length baffle thermal