How do I determine the correct length for classic poles?

The standard formula is approximately 83% of your body height, or the pole should reach to your armpit when standing on a flat floor in your ski boots. For example, a 175 cm tall skier would typically use 145 cm poles. However, arm length and torso proportions vary, so the armpit test is more reliable than the percentage formula. When between sizes, classic skiers generally go slightly longer for better push angle, especially if they do a lot of double-poling.