Serenity 350 MummyTheres nothing more important than a good nights sleep, and our Serenity 350 will keep you warm and snug on cold nights. The tough shell is filled with a synthetic insulation that holds its warmth even when it gets wet, so tent condensation will never disturb your sleep again. The mummy shape provides maximum insulation and makes it lighter to carry, so when you pack up camp, its easy to stuff it in its compression sack and squeeze it into your pack.