Lovingly known as "Buffalos" in the British Armed Forces, these bad boys are guaranteed to keep you nice and comfy in the field. These lightweight and packable Thermal Smocks are. They've got three large zipper front pockets, a 1/4 zip front and a stowable hood.
They're also fleece lined, making them incredibly cozy. Ventilation zips on armpits and lower torso.