Show your support with confidence in our World Down Syndrome Day 321 Men’s T-Shirt — created to honor March 21 (3/21), symbolizing the three copies of the 21st chromosome known as Trisomy 21.
This men’s awareness shirt is designed for fathers, brothers, teachers, advocates, and supporters who proudly stand for inclusion. Whether you're attending a World Down Syndrome Day event, supporting a loved one, or raising awareness year-round, this tee helps you represent with purpose.
Why “321”?
The number 321 represents:
• 3 copies
• Of the 21st chromosome
• Celebrated globally on March 21
Product Features:
• Soft, breathable cotton blend
• Classic men’s fit for everyday comfort
• Durable, high-quality print
• Easy to style for casual or event wear
Perfect For:
✔ World Down Syndrome Day celebrations
✔ Down syndrome awareness events
✔ Matching family shirts
✔ Everyday advocacy and support
✔ Meaningful gift for dads and supporters
Strong. Supportive. Inclusive.
Wear your 321 proudly.
Size guide
| |
LENGTH (inches) |
WIDTH (inches) |
CHEST (inches) |
| XS |
27 |
16 ½ |
31-34 |
| S |
28 |
18 |
34-37 |
| M |
29 |
20 |
38-41 |
| L |
30 |
22 |
42-45 |
| XL |
31 |
24 |
46-49 |
| 2XL |
32 |
26 |
50-53 |
| 3XL |
33 |
28 |
54-57 |
| 4XL |
34 |
30 |
58-61 |
| 5XL |
35 |
31 |
62-65 |
