First, you get the recommended height and then the recommended chest circumference of the user. Finally, there’s the NATO size code. The collar is fairly tight, so if you have a wrestler’s neck you might want to keep it unzipped unless you wanna choke yourself to submission.

With the gray ones we noticed that the sleeves and hem are short for the recommended person height. This is a good thing, if you don't want that many layers all the way over the wrist. Pick a size meant for a taller person if you want sleeves of a more ordinary length.

Just to bring you some extra insight, we have given the US equivalents to both height and chest circumference. First NATO size, then US size. Some of the height classes fall between the US standards.

NATO-US Size conversions

Materials and care

These turtlenecks are 80/20 cotton/polyester. The surface is smooth but the inside is terrycloth, which is rough enough that tender-skinned individuals might not want these on bare skin. Besides, having a Merino wool shirt underneath is the ideal option anyway. Wash at 60 degrees Celsius (140 F). We got shirts at least from the 1990s and 2000s, so the thickness, feel, and shade of the fabric vary a bit from batch to batch.