The filling made of synthetic fibers and wool in the SylvaHe Parka by Heber Peak provides ample warmth without being overly bulky. Combined with the 10,000 mm water column of the outer fabric, you are well protected from the elements even on uncomfortable days. The adjustable hood shields the head and neck from wind and cold, and it can be removed if needed. Velcro fasteners and snug-fitting sleeve cuffs prevent cold weather from penetrating and help retain body heat.