'To Fit' (Chest/Inches):
XS: 34-36"
SM: 37-39"
MED: 39-41"
LRG: 41-43"
XL: 43-45"
2XL: 46-48"
3XL: 49-51"
4XL: 52-54"
Garment is 'Fitted' to aid keeping warmand comes up small for the size description.
Smaller Baselayers (JnrSM - JnrLRG) retail at £28.50.