Updated with streamlined PrimaLoft ThermoBall baffles contoured to fit your body, maintain your core warmth while winter camping in cold, wet weather with our latest advancement in lightweight insulation technology. The new synthetic insulation technology features round ThermoBall clusters that trap and retain heat to achieve phenomenal warmth in cold, wet weather. Wear this thermal vest as a mid-layer for added warmth on the coldest winter days, or pack it for emergency protection in the backcountry. Zippered hand pockets. Internal elastic cuffs. Hem cinch-cord system in hand pockets. Stows in hand pocket.