how do I determine correct size

Here is Ansel Glove Chart.

Measure around the widest part of palm.

XS 5 ½” -6”

S 6 ½”-7”

M 7 ½” - 8”

L 8 ½” - 9”

XL 9 ½”- 10”

XXL 10 ½ - 11”