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FAQs (Frequently Asked Questions)
If you don't find your question answered on our FAQ pages, please contact us.
Adult sizes:
This size chart works for most of our adult t-shirts. T-shirts can vary a bit from these measurements, but will generally be close.
The Unit Circle t-shirt and the Unit Circle to Sine Wave t-shirt tend to be a little larger; we'll get sizing info for them up soon.
Except for the Unit Circle t-shirt and the Unit Circle to Sine Wave t-shirt, our t-shirts are preshrunk cotton. They may shrink a little, but won't shrink very much.
| Size |
Width
(inches) |
Length
(inches) |
Width
(cm) |
Length
(cm) |
| Adult Small |
18 |
28 |
46 |
71 |
| Adult Medium |
20 |
29 |
51 |
74 |
| Adult Large |
22 |
30 |
56 |
76 |
| Adult XL |
24 |
31 |
61 |
79 |
| Adult 2XL |
26 |
32 |
66 |
81 |
| Adult 3XL |
28 |
33 |
71 |
84 |
| Adult 4XL |
30 |
34 |
76 |
86 |
| Adult 5XL |
32 |
35 |
81 |
89 |
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Youth sizes:
Unfortunately, youth sizing is not consistent from t-shirt manufacturer to manufacturer, and we sell shirts from more than one manufacturer.
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The chart below applies to most of our youth t-shirts, including:
- All math shirts;
- May the F=ma Be With You;
- Science is Awesome;
- Dinosaurs of the World in Sand (but not in Taupe);
- Planets;
- Star Map;
- Heavenly Bodies;
- Einstein Starry Night;
- Geology Rocks;
- Periodic Table.
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| Size |
Width
(inches) |
Length
(inches) |
Width
(cm) |
Length
(cm) |
| Youth Extra Small (2-4) |
15.5 |
19.5 |
39.5 |
49.5 |
| Youth Small (6-8) |
17 |
21.5 |
43 |
54.5 |
| Youth Medium (10-12) |
18 |
23 |
46 |
58.5 |
| Youth Large (14-16) |
19 |
25 |
48 |
63.5 |
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The chart below applies to these youth t-shirts:
Dinosaur Alphabet;
One Argentinosaurus;
Big Dipper;
Skeleton;
Dinosaurs of North America;
Science!
Dinosaurs of the World in Taupe (but not in Sand);
Science is Awesome;
Astronomy is Out There.
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| Size |
Width
(inches) |
Length
(inches) |
Width
(cm) |
Length
(cm) |
| Youth Extra Small (2-4) |
14 |
18.5 |
35.5 |
47 |
| Youth Small (6-8) |
15 |
20.5 |
38 |
51 |
| Youth Medium (10-12) |
17 |
22.5 |
43 |
57 |
| Youth Large (14-16) |
18 |
24.5 |
46 |
62 |
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If you don't find your question answered on our FAQ pages, please contact us.
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