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Person wearing geometric koi hoodie at aquarium expo
Reef tank hobbyist showing Fin tee beside coral display
Laughing person in geometric koi hoodie with 300-gallon reef glowing behind them
Fish swap attendee wearing betta tessellation tee
New Drop: Reef Geometry Series

Wear the
Tank.

Geometric aquarium art on oversized tees, enamel pins, and bucket hats. Built for the people who name their shrimp.

Book a Custom DropShop the Collection
🐠 2,400+ fish nerds wearing Fin·⭐ 4.9 avg rating
🐡 Betta Tessellation Tee◆🪸 Reef Geometry Bucket Hat◆🦐 Neocaridina Pin Set◆🐠 Angelfish Triangle Tee◆🌿 Planted Tank Crewneck◆🐡 Betta Tessellation Tee◆🪸 Reef Geometry Bucket Hat◆🦐 Neocaridina Pin Set◆🐠 Angelfish Triangle Tee◆🌿 Planted Tank Crewneck◆🐡 Betta Tessellation Tee◆🪸 Reef Geometry Bucket Hat◆🦐 Neocaridina Pin Set◆🐠 Angelfish Triangle Tee◆🌿 Planted Tank Crewneck◆🐡 Betta Tessellation Tee◆🪸 Reef Geometry Bucket Hat◆🦐 Neocaridina Pin Set◆🐠 Angelfish Triangle Tee◆🌿 Planted Tank Crewneck◆
The Collection

Each Piece, an Exhibit.

Not merch. Wearable prints that belong on a gallery wall as much as on your back at a fish swap.

Flat-lay of Betta Tessellation oversized tee on purple geometric background
Collection 01

Betta Tessellation Tee

Your half-moon betta, fractured into 847 polygons across 100% organic cotton.

Oversized FitOrganic CottonWater-Based Ink
$48Shop Now

Print & Tag Detail

Close-up of tessellated betta fish polygon print texture on fabric
Fin brand woven tag detail on collar of betta tee
Flat-lay of Reef Geometry bucket hat on deep blue geometric background
Collection 02

Reef Geometry Bucket Hat

Sixty-four coral species rendered as interlocking triangles. Wear your reef everywhere.

UV-ResistantScreen PrintOne Size Fits Most
$36Shop Now

Print & Tag Detail

Close-up of screen-printed coral reef geometry on bucket hat brim
Interior sweatband and Fin logo stamp inside bucket hat
Flat-lay of three angelfish fracture enamel pins on orange geometric background
Collection 03

Angelfish Fracture Pin Set

Three hard enamel pins. One angelfish, three colorways, infinite lapel combinations.

Hard EnamelRubber Clutch BackLimited Run
$22 / setShop Now

Print & Tag Detail

Close-up of hard enamel angelfish triangle fracture pin showing detail
Three angelfish pins displayed on denim jacket at fish convention
Community

The Tank-Side Community.

Aquarium hobbyist at fish swap wearing Fin betta tee

@reef_nerd_ryan

Planted tank keeper beside lush aquascape in Fin crewneck

@plantedtank.petra

Betta breeder holding spawn container in geometric koi hoodie

@betta_breeder_bex

Reef tank keeper at convention with Fin angelfish pin on lanyard

@saltwater.simone

Aquarium society member at local fish store in Fin tee

@aqsoc_marcus

“
“I've been breeding bettas for eleven years. The Tessellation Tee is the first piece of clothing that actually looks like it was made by someone who's spent a Sunday morning staring at a veil-tail betta and thinking about geometry. It's not just merch — it's a conversation starter at every fish swap I go to.”
Portrait of betta breeder Cassidy Morrow

Cassidy Morrow

Betta Breeder · Pacific Northwest Aquarium Society

★★★★★
Custom Drops

Sketch to Shipped.

Three past custom projects. Toggle between the original concept and the finished piece — because the process is the proof.

Click any card to flip between sketch and final print
Hand-drawn sketch of Pacific salmon concept for aquarium society club shirt
✏ Sketch
Flip
Club Shirts

Pacific Northwest Aquarium Society

The PNAS wanted their annual swap commemorated — a shirt that members would actually wear year-round, not toss in a drawer. We took their sketch of a Pacific salmon and fractured it into 400 polygons.

Turnaround

18 days

Quantity

120 shirts

Reference photos of Coral Cove Aquatics store reef tank for uniform design
✏ Sketch
Flip
Store Uniforms

Coral Cove Aquatics (LFS)

A local fish store needed uniforms that matched their nano-reef aesthetic — something the staff would be proud to wear on the floor. We built a coral fracture pattern from their actual tank photos.

Turnaround

14 days

Quantity

24 polos

Early concept sketch of Great Lakes fish fractal for AquaExpo Chicago exclusive hoodie
✏ Sketch
Flip
Convention Exclusives

AquaExpo Chicago 2025

The organizers wanted a limited-edition hoodie that would sell out before noon on day one. We designed a Great Lakes fish fractal — never reprinted, never restocked. Gone in 4 hours.

Turnaround

21 days

Quantity

200 hoodies

Ready to see your club's fish on a shirt?

Book Your Custom Drop
Custom Drops — Book a Consultation

Book a Custom Drop.

For aquarium clubs, local fish stores, and event organizers. Tell us about your project and we'll get back within 24 hours.

We reply within 24 hours. No pressure, no commitment — just a conversation about your fish.

24-hr response
No payment until you approve the design
Ships to all 50 states