CLIMATE CONTROL ON-THE-GO Ravean heated jackets have three heat settings to help you stay ahead of the cold: • For sub-zero weather (temperatures as low as -10° F / 23° C), use HIGH mode to stay nice and toasty for more than 2 hours. • When the weather dips below freezing (15° F / -9° C), switch to MEDIUM mode and stay warm for up to 5 hours. • For near-freezing weather (38° F / 3° C), activate LOW mode to keep things warm for up to 6 hours. • And if the weather is just moderately cool, save battery power and use our super warm, heated down jacket.