Youth t-shirt with "It took 13.7 billion years to make something this perfect" on the front. A QR code on the back that goes to richardddawkins.net with "Ibelievescience.net" on one sleeve and "richarddawkins.net" on the other.

 6.1 Oz., 100% preshrunk cotton jersey knit t-shirt. Seamless coverseam stitched collar. Taped neck and shoulders. Quarter turned, tubular knit construction. Double needle stitched sleeve and bottom hem.

 

Youth unisex sizes

 

Measuring across the chest (under the armpits)

 

XS   30"  -  76cm

S     32"  -  81cm

M    34"  -  86cm

L     36"  -  91cm