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Fast Inverse Square Root
Fast Inverse Square Root
Regular price
$21.00 USD
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$21.00 USD
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For the hardcore math wizards and graphics geeks who know their algorithms, this tee pays tribute to the legendary Fast Inverse Square Root function—a snippet of code so brilliant, it’s still blowing minds decades later. With the iconic implementation front and center, this shirt is perfect for showing off your appreciation for that perfect blend of math, magic, and optimization. Whether you’re a game dev, graphics guru, or just a fan of jaw-dropping code hacks, this tee lets you wear a piece of computing history.
• 100% cotton
• Fabric weight: 5.0–5.3 oz/yd² (170-180 g/m²)
• Open-end yarn
• Tubular fabric
• Taped neck and shoulders
• Double seam at sleeves and bottom hem
This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!
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• 100% cotton
• Fabric weight: 5.0–5.3 oz/yd² (170-180 g/m²)
• Open-end yarn
• Tubular fabric
• Taped neck and shoulders
• Double seam at sleeves and bottom hem
This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!
Size guide
LENGTH (inches) | WIDTH (inches) | SLEEVE LENGTH (inches) | |
S | 28 | 18 | 15 ⅝ |
M | 29 | 20 | 17 |
L | 30 | 22 | 18 ½ |
XL | 31 | 24 | 20 |
2XL | 32 | 26 | 21 ½ |
3XL | 33 | 28 | 22 ¾ |
4XL | 34 | 30 | 24 ¼ |
5XL | 35 | 32 | 25 ¼ |
LENGTH (cm) | WIDTH (cm) | SLEEVE LENGTH (cm) | |
S | 71.1 | 45.7 | 39.7 |
M | 73.7 | 50.8 | 43.2 |
L | 76.2 | 55.9 | 47 |
XL | 78.7 | 61 | 50.8 |
2XL | 81.3 | 66 | 54.6 |
3XL | 83.8 | 71.1 | 58 |
4XL | 86.4 | 76.2 | 61.5 |
5XL | 89 | 81.3 | 64.3 |


















