Gelert hibernate 400 sleeping bag this gelert hibernate 400 sleeping bag has a mono fibre filling with a mummy hood and zipped and shoulder baffle for increased heat retention making it ideal for mild to cold nights without frost but a low temperature this sleeping bag has an arrow foot shape for better comfort along with the quick pack away design for easy transportation sleeping bag unrolled size h240 x foot w60 x shoulder w90cm shell 190t70d polyesterand 210t70d ripstop