Various Sizes- size chart in pictures
 
Air jet yarn, softer feel and reduced pilling.
Drop shoulder style.
Classic fit.
Double lined hood.
Tubular body.
Front pouch pocket.
Ribbed cuffs and hem with spandex.
Twin needle stitching.
 
Based on the UK Average Sizing 
X-Small - 3/4
Small 5/6
Medium 7/8
Large 9/10
XL 11/12 (Small Mens)