Slim fit. Compressible and very easy to fit into small hiking pack. Thumb holes. Lightweight but medium warmth (I wore this before sunrise on hikes at high altitude) Water resistant Synthetic insulation LIGHTWEIGHT WARMTH A lightweight jacket with serious warmth. Synthetic down insulation and thermal-reflective lining provide dual heat retention for chilly days and nights. The shell fabric is also water-resistant while the soft, plush-lined collar wards off wind and chill. Omni-Heat™ thermal-reflective breathable lining retains warmth using silver dots that reflect body heat, so you stay warm and comfortable as temps drop Water-resistant fabric sheds moisture using materials that repel water, so you stay dry in mildly rainy conditions Plush lined collar Interior security pocket Zippered hand pockets Drop tail Comfort cuff with thumb hole