I are not able to find a name for this sort of collar…is apparently included from princess seams on the shirt. It rises significant from the back and sides (about jaw length) then splits open toward chin and goes down to a “V”. I don it out simply because that https://vivushirt.com/product/zio-lovedoveclarke-i-holla-for-collards-shirt-t-shirt-hoodie-sweater-long-sleeve-tshirt-and-tank-top/