The lightweight shell fabric is 2-oz

including the pass-through full-width back pocket originally used to stow maps and charts

This is the same construction as used in the manufacture of white-water rafting gear

The interior features adjustable

filson man wool journeyman jacket fmcps0135ut3038 525 DEP180225 The lightweight shell fabric isThe Wool Journeyman Jacket is a heritage inspired classic, built to stand up to the harshest cold. Crafted from a warm, durable wool blend, it features a button front closure, four flap and button pockets, and adjustable cuffs for a secure fit. Rugged, functional, and timeless, this jacket is made to last for years of wear.