The PRO Merino is a great choice for those needing a versatile shirt that's useful in a wide range of conditions. Shop merino wool gear and more at KUIU.
Don’t sacrifice in garment quality because it “needs” to be camo.
If you’re dead set on needing Merino as the mid layer (works fine but not as good/versatile as a waffle or grid fleece) then the ridge merino convict canyon hoodie is quite good. It’s a merino blend that’s holding up well in about 8 months of use so far.
I’d personally recommend the Patagonia R1 Air as your mid layer though if I had to choose just one for all hunts. I’ve been using that piece since it released in 2020 for backpacking and hunting. From Arizona desert to Alaska tundra, it’s an incredibly versatile price of clothing.
I consider my FL Kilns as a mid layer and theyre my favorite piece they make and about the only FL stuff I have left. I wouldnt wear it much as an outer layer in the woods though.