Size guide
Size Guide
Three ways to find your size. Start at the top — most people never need to scroll past it.
Read this first if you're buying more than one piece. Our Heavyweight Tee and our Essential Tee are cut on different blanks, and the Essential runs about one size smaller. If you wear M in the Heavyweight, take L in the Essential. Same shirt size on the label, different shirt on your body — we'd rather tell you now.
1. The quick answer
Heavyweight Tee — 240gsm
The Blockchain, North Star and Bitcoin collections.
Cut oversized on purpose, with a dropped shoulder. Take your usual size and it fits the way it's meant to.
| Your usual t-shirt size | For the oversized fit (as designed) | For a regular fit |
|---|---|---|
| XS | XS | — |
| S | S | XS |
| M | M | S |
| L | L | M |
| XL | XL | L |
| 2XL | 2XL | XL |
| 3XL | 3XL | 2XL |
In short: same size for the look on the model. One size down if you want it closer to the body.
Essential Tee — 207gsm
A relaxed, boxy garment-dyed tee — but it runs smaller than our Heavyweight. Most people take one size up here.
| Your usual t-shirt size | Order |
|---|---|
| XS | S |
| S | M |
| M | L |
| L | XL |
| XL | 2XL |
| 2XL | 3XL |
| 3XL | 4XL |
Sizes run S to 4XL. There's no XS in this style — if you'd normally wear one, take S and expect a relaxed fit.
Heavyweight Hoodie — 330gsm
Cut generous, but not oversized. Take your usual size.
| Your usual hoodie size | Order |
|---|---|
| S | S |
| M | M |
| L | L |
| XL | XL |
| 2XL | 2XL |
| 3XL | 3XL |
Wearing it over a heavyweight tee? Go one size up.
2. By your measurements
Don't know your usual size, or caught between two? Measure around your chest, at the fullest point, tape level and not pulled tight.
This is your body, not a garment laid flat.
Heavyweight Tee
| Your chest — cm | Your chest — inches | Oversized fit | Regular fit |
|---|---|---|---|
| 78–86 | 31–34 | XS | — |
| 86–94 | 34–37 | S | XS |
| 94–102 | 37–40 | M | S |
| 102–110 | 40–43 | L | M |
| 110–118 | 43–46 | XL | L |
| 118–126 | 46–50 | 2XL | XL |
| 126–134 | 50–53 | 3XL | 2XL |
Essential Tee
| Your chest — cm | Your chest — inches | Order |
|---|---|---|
| 78–86 | 31–34 | S |
| 86–94 | 34–37 | M |
| 94–102 | 37–40 | L |
| 102–112 | 40–44 | XL |
| 112–122 | 44–48 | 2XL |
| 122–131 | 48–52 | 3XL |
| 131–140 | 52–55 | 4XL |
Heavyweight Hoodie
| Your chest — cm | Your chest — inches | Order |
|---|---|---|
| 86–94 | 34–37 | S |
| 94–102 | 37–40 | M |
| 102–110 | 40–43 | L |
| 110–118 | 43–46 | XL |
| 118–126 | 46–50 | 2XL |
| 126–134 | 50–53 | 3XL |
Between two sizes? Go up for the oversized look, down for a closer fit.
3. International sizes
Our tees and hoodies are unisex, and letter sizes are the same worldwide. A Medium in Australia is a Medium in the US, the UK and Europe. Nothing to convert.
The table below is for women buying the unisex fit — where dress sizes genuinely differ by country.
| AU / UK | US | EU | Heavyweight Tee | Essential Tee | Hoodie |
|---|---|---|---|---|---|
| 6 | 2 | 34 | XS | S | S |
| 8 | 4 | 36 | XS | S | S |
| 10 | 6 | 38 | S | M | S |
| 12 | 8 | 40 | S | M | M |
| 14 | 10 | 42 | M | L | M |
| 16 | 12 | 44 | M | L | L |
| 18 | 14 | 46 | L | XL | L |
| 20 | 16 | 48 | L | XL | XL |
Most women wearing our tees size for the drape rather than the fit — an AU 10 in a Heavyweight M gives the boxy, longer look the garment was cut for. Stay in the column above for a closer fit.
Conversions are approximate. Sizing varies between brands in every country.
4. Full garment measurements
For anyone who'd rather compare against a garment they already own.
How to use these: lay a t-shirt you like flat, without stretching it. Measure straight across the chest, one inch below the armhole. Match that number to the chest column.
Chest here is half the circumference — a 55cm chest width is roughly 110cm around.
Heavyweight Tee — 240gsm
| Size | Chest (cm) | Chest (in) | Length (cm) | Length (in) |
|---|---|---|---|---|
| XS | 47 | 18.5 | 68 | 26.8 |
| S | 51 | 20.1 | 70.5 | 27.8 |
| M | 55 | 21.7 | 74 | 29.1 |
| L | 59 | 23.2 | 77.5 | 30.5 |
| XL | 63 | 24.8 | 81 | 31.9 |
| 2XL | 67 | 26.4 | 84.5 | 33.3 |
| 3XL | 71 | 28.0 | 86.5 | 34.1 |
Fit: oversized, dropped shoulder.
Tolerance: up to 2.5cm variation — within the manufacturer's stated tolerance for garment-dyed cotton.
Reference: our fit model is 178cm and wears a size L.
Essential Tee — 207gsm
| Size | Chest (cm) | Chest (in) | Length (cm) | Length (in) | Sleeve*(cm) | Sleeve* (in) |
|---|---|---|---|---|---|---|
| S | 46.4 | 18¼ | 67.6 | 26⅝ | 41.3 | 16¼ |
| M | 51.4 | 20¼ | 71.1 | 28 | 45.1 | 17¾ |
| L | 55.9 | 22 | 74.6 | 29⅜ | 48.3 | 19 |
| XL | 61.0 | 24 | 78.1 | 30¾ | 52.1 | 20½ |
| 2XL | 66.0 | 26 | 80.3 | 31⅝ | 55.2 | 21¾ |
| 3XL | 70.5 | 27¾ | 82.5 | 32½ | 59.1 | 23¼ |
| 4XL | 75.6 | 29¾ | 85.1 | 33½ | 62.5 | 24⅝ |
Fit: relaxed and boxy. Runs about one size smaller than our Heavyweight Tee.
Tolerance: up to 5cm variation. Garment dyeing shrinks each piece slightly differently, and this blank has a wider stated range than our heavyweight — if you're between sizes, take the larger one.
*Sleeve is measured from the centre back of the collar to the cuff, not from the shoulder seam.
Heavyweight Hoodie — 330gsm
| Size | Chest (cm) | Chest (in) | Length (cm) | Length (in) | Sleeve* (cm) | Sleeve* (in) |
|---|---|---|---|---|---|---|
| S | 53.3 | 21 | 72.4 | 28.5 | 87.6 | 34.5 |
| M | 58.4 | 23 | 74.9 | 29.5 | 90.2 | 35.5 |
| L | 62.2 | 24.5 | 77.5 | 30.5 | 92.7 | 36.5 |
| XL | 67.3 | 26.5 | 80.0 | 31.5 | 95.3 | 37.5 |
| 2XL | 69.9 | 27.5 | 82.6 | 32.5 | 97.8 | 38.5 |
| 3XL | 72.4 | 28.5 | 85.1 | 33.5 | 100.3 | 39.5 |
Fit: generous.
*Sleeve is measured from the centre back neck to the cuff, not the shoulder seam — which is why the number looks larger than you'd expect. Don't compare it to a t-shirt sleeve.
Kids Tee
| Size | Chest (cm) | Chest (in) | Length (cm) | Length (in) |
|---|---|---|---|---|
| YS | 38.7 | 15.25 | 53.0 | 20.9 |
| YM | 41.3 | 16.25 | 56.2 | 22.1 |
| YL | 43.8 | 17.25 | 59.4 | 23.4 |
| YXL | 46.4 | 18.25 | 61.9 | 24.4 |
We publish measurements rather than ages — children of the same age vary enormously. Lay flat a t-shirt that already fits, measure the chest, and match it.
Still unsure? Email support@theblockchainstore.co and we'll tell you which size to take.
THE BLOCKCHAIN STORE sells apparel and accessories. Nothing on this site is financial or investment advice. We are not affiliated with, endorsed by or sponsored by any cryptocurrency project, foundation or exchange.