A simple sequence that appears everywhere.

0 1 1 2 3 5 are the opening numbers of the Fibonacci sequence — a pattern where each number is the sum of the two before it.

From algorithms and computer science to nature, art, and architecture, this sequence represents growth, structure, and elegant simplicity.

For developers, Fibonacci shows up early: recursion exercises, algorithm discussions, and technical interviews. It’s often the first glimpse into how systems evolve from simple rules.

Simple pattern. Expanding structure. Universal logic.

Because sometimes the most powerful systems begin with the simplest patterns.

Product details

100% organic ring-spun cotton
5.3 oz./yd² (180 g/m²)
Single jersey construction
Medium fit
Set-in sleeves
1 × 1 ribbed collar
Double-needle stitching (sleeves & hem)
Self-fabric neck tape

Certified under GOTS, OCS, OEKO-TEX Standard 100, and PETA-Approved Vegan.

Blank product sourced from Bangladesh.

Note: Sizes correspond to a smaller fit in the US market. US customers may prefer ordering one size up.

Made on demand

This product is made especially for you as soon as you place an order, helping reduce overproduction.

Compliance

• Traceability:
- Weaving—Bangladesh
- Dyeing—Bangladesh
- Manufacturing—Bangladesh
• Contains 0% recycled polyester
• Contains 0% dangerous substances

Age restrictions: For adults
EU Warranty: 2 years
Meets EU REACH requirements

In compliance with the General Product Safety Regulation (GPSR), Developers Threads and SINDEN VENTURES LIMITED ensure product safety and EU standards.
Contact: gpsr@sindenventures.com
Address: Markou Evgenikou 11, Limassol, Cyprus

Size guide