What size DidySling Ring Sling do I need?

The Size 1 fits people wearing people wearing sizes XS - XL.
The Size 2 is suited for people wearing sizes XL - 4XL.
Measurements
Size 1: 170 -180 cm /  67 - 71 inches
Size 2: 190 - 210 cm  / 75 - 83 inches
The sling tail has a tapered end and the length is measured along the shorter edge.