Pay attention to the sizing guide. These have your name embroidered into the them so returns are only on faults. 
 
Embroidered with your First Name
High performance soft touch fabric for all day comfort
Natural stretch allows for ease of movement and resists creasing
Hygienic High-Temperature Laundry Friendly to 80 C
Durable and breathable poly/cotton blend is perfect for easy wash/wear
Shrink resistant and colourfast
Functional front hip pockets with inner concealed pockets to stow equipment essentials
Additional Left Chest Pocket with pen provision
Standard gender-free loose fit suitable for all