Between 10-27cm / 4 3/4-10in positive ease depending on size.

Sizes (no ease included)
XS - 80-90cm / 32-36in
S - 90-95cm / 36-38in
M - 100-105cm / 40-42in
L - 110-115cm / 44-46in
XL - 120-125cm / 48-50in