Fit Notes Every head is different, but with Thousand’s integrated dial fit system, it's easy to make small adjustments for a comfortable fit. Just turn the dial clockwise to tighten or counter clockwise to loosen. You can also remove some or all of the interior fit pads without affecting the safety of your lid to accomplish your preferred fit. Steps: 01 FIND A MEASURING TOOL Find a flexible measuring tape or a phone charger (and a ruler to measure it against). 02 MEASURE Wrap the cord around your head just above the eyebrows. 03 FIND YOUR SIZE Use the chart above to find your size. If you’re in-between sizes, size down.