Gelert hebog 200 sleeping bag this gelert hebog 200 sleeping bag is constructed with a polyester shell and mono fibre polyester filling the gelert sleeping bag is a classic mummy shape ensuring a snug fit with a season rating of 1 2 this sleeping bag is better for the warmer months packing away into a durable stuff sack for easy transportation and storage sleeping bag polyester shell and filling season 1 2 rating maximum temperature 119c comfort temperature 78c