YellowIbis.com: The best science t-shirts, chemistry t-shirts, nerd t-shirts, and more. 

Size	S	M	L	XL	XXL
Measure A (inch)	28.0	28.7	29.5	30.7	32.0
Measure B (inch)	18.0	20.0	21.0	24.0	26.0

This men's t-shirt has a relaxed but tailored fit. The seamless rib collar with double-needle cover-stitching, shoulder to shoulder taping, double-needle sleeve and bottom hem make it a durable wear. Made from 100% pre-shrunk cotton with a fabric weight of 6.1 oz. Ash is made of 90% cotton/10% polyester and heather gray is made from 99% cotton/1% polyester.

Flex print (plot print with a smooth finish)

• a slightly shiny surface and smooth to the touch
• extremely durable
• up to 3 different colors per design