Rab's Ignition series consists of lightweight, synthetic-insulated sleeping bags built for backpacking, and the Ignition 1 Sleeping Bag is the lightest of the bunch designed for warmer weather. Synthetic-insulated bags are necessary when you're adventuring wetter climates. Compared to down, synthetic insulation maintains its warmth in moisture-riddled environments. Rab also treated this bag with DWR for enhances protection from wet weather.