Adult 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.

 4.5 oz., 100% preshrunk ringspun cotton Seamed collar Taped shoulder to shoulder Classic semi-contoured silhouette with side seam / Double-needle stitched sleeve and bottom hem.

Ladies sizes and styling - shorter sleeves, wider neck, and contour styling.

Note that these run quite small.

Measured around the chest (under the armpits).

Small     32" - 81cm

Medium 34" - 86cm   

Large     36" - 91cm

XL          38" - 96cm

2X          40" - 102cm