BASE number
To start off, BASE jumping is an acronyme for Building Antenae (uninhabited tower) Span (bridge or arch) Earth. It is very similar to sky diving, however the is no plane. If you are to complete a BASE jump off of at least one of each of the four different genres covered in the acronyme BASE, you can apply for a BASE number. They are awarded sequentially starting with BASE-1 to the thousands.
The Urban Dictionary Tee

Not only was the product exactly what I expected, I was well informed on the shipping process in a seamless and timely manner!
The T-shirt was a birthday gift for my girlfriend and she absolutely loved it.

Happy that this tee is comfy and fits well. I wish the sentence was on the back too.
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Size Guide
Measurements may vary by up to 2" (5 cm). Pro tip: Measure one of your t-shirts at home and compare!
A - Length
Measure from the top of the collar to the bottom hem
B - Width
Measure across the chest from armpit to armpit
Size Chart
| Size | Length | Width |
|---|---|---|
| XS | 27" | 16½" |
| S | 28" | 18" |
| M | 29" | 20" |
| L | 30" | 22" |
| XL | 31" | 24" |
| 2XL | 32" | 26" |
| 3XL | 33" | 28" |
| Size | Length | Width |
|---|---|---|
| XS | 69 cm | 42 cm |
| S | 71 cm | 46 cm |
| M | 74 cm | 51 cm |
| L | 76 cm | 56 cm |
| XL | 79 cm | 61 cm |
| 2XL | 81 cm | 66 cm |
| 3XL | 84 cm | 71 cm |