I Are not able to find a name for this kind of collar…appears to be integrated from princess seams on the shirt. It rises substantial within the again and sides (about jaw length) then splits open towards chin and goes right down to a “V”. reminds me of my other https://vivushirt.com/product/zio-lovedoveclarke-i-holla-for-collards-shirt-t-shirt-hoodie-sweater-long-sleeve-tshirt-and-tank-top/