The Quest Ridgeline -5° Sleeping Bag will keep you toasty warm on cold nights. Beware! Upgrading to one of these sleeping bags might make it hard to get out of bed in the morning! A soft touch, low-noise, brushed polyester shell and lining prevents rustling and gives you all the benefits of a synthetic shell/lining - but with the feel of cotton. Sandwiched within the soft outer shell is our Monoloft synthetic fill insulation.