Really depends on what type of hunting your doing. Like others say layering is a must. I start with merino wool base layers and mid layers then a shell of some sort. Depending on how thick your shell or outer layer is will decide what your mid layer needs to be. I always keep my puffy jacket and pants in my bag so if I'm glassing or sitting I can through those on. Experimenting is your best bet because everyone's body is different
Just bought the sitka Kelvin down hoody. Pretty stoked to see how that performs goat hunting this year. But like everyone else is saying, layer according to your hunting style. Merino is king