We make one of these for the kid every year. These make great birthday presents for any teen who loves math.  Adult unisex size.
Econscious EC1000 unisex t-shirts for men and women feature a 100% Certified-Organic, ring-spun cotton fabric. Also equipped with an organic cotton/ 1x1 neck rib, and a shoulder seam that is clean-finished with self-fabric tape, these printable tees deliver in both comfort and style.
.: 100% certified organic, ring-spun cotton
.: Medium fabric (5.5 oz/yd² (186 g/m²))
.: Regular fit
.: Tear-away label
 
 



 
S
M
L
XL
2XL




Width, in
18.50
20.50
22.50
24.50
26.50


Length, in     
27.00     
28.00     
29.00     
30.00     
31.00