Gear for Divers Who Live for the Deep
Made to order
Every piece is printed just for you — no overstock, no waste.
Worldwide shipping
Fulfilled and shipped through our trusted print partner.
Secure checkout
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Designed by divers
Retro dive culture, drawn for those who love the deep.
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Shop the Collection
Designed by divers.
Built for the deep.
Size guide
Unisex fit - If you're between sizes, we suggest sizing up.
| Size | Chest (to fit) | Body length | Sleeve length |
|---|---|---|---|
| S | 34–37" | 28" | 16 ¾" |
| M | 38–41" | 29" | 17 ⅞" |
| L | 42–45" | 30" | 19 ⅛" |
| XL | 46–49" | 31" | 20 ⅜" |
| 2XL | 50–53" | 32" | 21 ⅝" |
| 3XL | 54–57" | 33" | 22 ¾" |
| Size | Chest (to fit) | Body length | Sleeve length |
|---|---|---|---|
| S | 86–94 cm | 71 cm | 42.5 cm |
| M | 97–104 cm | 74 cm | 45.4 cm |
| L | 107–114 cm | 76 cm | 48.6 cm |
| XL | 117–124 cm | 79 cm | 51.8 cm |
| 2XL | 127–135 cm | 81 cm | 54.9 cm |
| 3XL | 137–145 cm | 84 cm | 57.8 cm |
How to measure
- Chest: measure around the fullest part of your chest, keeping the tape level.
- Body length: from the highest point of the shoulder straight down to the hem.
- Sleeve length: from the center back of the collar along the sleeve to the cuff.
Tip: lay a t-shirt you already love flat and compare it to the chart for the most confident fit.
Measurements are provided by the manufacturer (Printful / Gildan 64000) and may vary by up to 2 inches (5 cm).
What Divers Are Saying
Real words from the Nitrox Republic crew.
Frequently asked questions
How do your shirts fit?
Our tees are a unisex Gildan Softstyle 64000 with a modern, true-to-size fit. You'll find a full size guide on every shirt product page. If you're between sizes or prefer a relaxed fit, we suggest sizing up.
When will my order ship?
Because every item is made to order, your order goes into production after you check out, then ships once it's ready. You'll receive tracking by email as soon as it's on the way.
Where do you ship?
We ship worldwide through our print-on-demand partner. Shipping options and timing are shown at checkout based on your destination.
What if my item arrives damaged or the wrong size?
If anything isn't right — a misprint, a defect, or a damaged item — email us at Sales@nitroxrepublic.com with your order number and a photo, and we'll make it right.
How should I care for my shirt?
To keep the print looking sharp, machine wash cold inside out, tumble dry on low, and avoid ironing directly over the design.
How can I reach you?
Questions about an order or a design? Email us any time at Sales@nitroxrepublic.com — we're happy to help.