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Pi

3.141592653589793238462643383
27950288419716939937510582097494
4592307816406286208998628034825
34211706798214808651328230664709
38446095505822317253594081284811
174502841027019385211055596446229
48954930381964428810975665933446
128475648233786783165271201909145
64856692346034861045432664821339
360726024914127372458700660631558
817488152092096282925409171536436
789259036001133053054882046652138
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95309218611738193261179310511854807
4462379962749567351885752724891227
9381830119491298336733624406566430
8602139494639522473719070...

Area = π x r²

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Special Releases

Pi


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Free shipping on orders $40+

  • Edition of 600
  • Glossy black and white concentric circle exterior
  • Translucent transcendental “digits of pi” interior
  • Polarized silver smoke lenses with a π lens etch
  • Silver hardware
  • FDA approved impact resistant lenses with full UV400 protection
  • Casio-style electronic calculator microfiber pouch
  • Includes a Charles Leonard CHL77360 bullseye metal compass
  • Hand-numbered edition card

These Pi Fort Knocks feature a glossy black and white concentric circle exterior frame (so you can hypnotize a secret crush), a translucent transcendental “digits of pi” interior, silver hardware, and polarized silver smoke lenses with a π lens etch. Designed on our durable and high quality frame, these sunglasses have a slightly wider fit than our other frame styles and provide full UV400 sun protection.

Every pair comes with a Casio-style electronic calculator microfiber pouch, a hand-numbered edition card, and a Charles Leonard CHL77360 bullseye metal compass so you can try solving the ancient challenge of squaring a circle with your compass and straightedge.

Knockaround is committed to customer satisfaction. We want to assure you are 100% satisfied with the product you purchased, which is why we offer a 30 day return / exchange period.

  • Returned / exchanged items must be in 100% resalable condition (unworn, unused, undamaged)
  • Timeframe begins at original purchase date
  • All returns and exchanges must be initiated from original point of sale (i.e.: Knockaround.com)

We do NOT currently accept returns or exchanges on Custom Shop orders, Limited Editions, Collaborations, Knock Boxes, Sale Items, or any international orders. All sales of those items are final.

To see full Return Policy information and instructions on how to initiate a return or exchange, visit our Returns page.

Size Guide

Laid-back or buttoned-up, Fort Knocks are durable, high-quality, and will add some cool to any outfit.

Size Guide

54mm Lens | 21mm Bridge | 139mm Temple
Frame: 148mm Width | 49mm Height

  • Medium to larger sized head shape.
  • Round, rectangular, diamond, or oval faces.
  • Perfect for standing or walking or sitting or... (see where we’re going with this?)
  • Free shipping on order over $40
  • Happiness guaranteed
  • The original affordable sunglasses company

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