It's made from thick cotton waffle material and is designed to be worn loosely, not fitted like traditional thermal/waffle fabrics.  
The inside is double-faced, giving it a texture similar to a regular T-shirt, so it feels comfortable even on bare skin.  
The sizing has been adjusted with the idea that you can wear it on its own. You can wear it alone or layer it with other pieces.


LENGTH  M28.7  L29.5  XL30.7(inch)
CHEST     M24.8  L25.5  XL26.7(inch)