Neck is shallow scoop with a slit, making a v-shape.

There is between 19-45cm / 6 1/2-17” positive ease.

Sizes (no ease included)
XS - 80-85cm / 32-34in
S - 90-95 / 36-38in
M - 105-110cm / 42-44in
L - 110-115cm / 44-46in
XL - 120-125cm / 48-50in