Don't bother, it acts more like a raincoat/jacket. It doesn't really insulate you from the cold unless you're already wearing a thick jacket underneath.
Previously, we usually layered with inner (heattech), 2nd layer cotton or wool shirt, 3rd layer fleece, then an outer shell.
So this Blocktech Parka is useless as an outer shell?
I had doubted this is not going to be effective for Korea winter, but wife likes the
design and lightweight.
!
I wear jeans without any heatech underneath with -7 to - 10 degrees temperature.