SilkWorld Men's Cotton Winter Autumn Silm Fit Thermal Long Johns;

Note: Before ordering, please carefully review the Amazon's Sizing info to ensure it is you need
About Height
US X-Small: Height(5'4-5'6 / 165cm-170cm) US Small: Height(5'6-5'7 / 170cm-175cm) US Medium: Height(5'7-5'9 / 175cm-180cm)

This items is the US Standard Size, but with a Asian Size Tags.
Because ofthe Asian size is about 2 size smaller than US size. For example: usually the Asian Tags "L" is equal to the US Size "S", and our item tag is printed in Asian size only.When you receive the item,please feel ok, it is just your size.

If you are obese body,please choose one size larger than you usually wear.
What is Modal?
Modal is a new high tech textile, a cellulose fiber that generates after spinning reconstituted cellulose and is mostly made from the beech trees. Modal is very soft and popularly used for household and clothing textiles. Modal becomes a substitute for cotton. However, it has some significant advantages that people enjoys over cotton. -- from Wiki