Undetectable = Untransmittable. It's just science! Help usher in a new era of understanding by proudly wearing this shirt (and patiently explaining the facts when someone asks you what it means).
- 96% polyester/4% elastane
- Premium knit mid-weight jersey
- Four-way stretch fabric that stretches and recovers on the cross and lengthwise grains
- Regular fit
Size guide
| XS | S | M | L | XL | 2XL | |
| Chest (inches) | 31 ¼ | 34 | 36 ⅜ | 42 | 47 | 51 ⅝ |
| Length (inches) | 27 ½ | 28 ¼ | 29 ⅜ | 30 ⅝ | 31 ¼ | 32 ¼ |
| XS | S | M | L | XL | 2XL | |
| Chest (cm) | 79 | 86 | 92 | 107 | 119 | 131 |
| Length (cm) | 70 | 72 | 75 | 78 | 79 | 82 |