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Paleontología y dinosaurios (ciencia, dominio público) Public domain

Sudadera de Jurassic Park / World

Ammonites · Crew neck sweatshirt, 50% cotton

Ammonites, crew neck sweatshirt en color negro

54.95 €

VAT included · shipping 4.29 € a

Delivery in 3-4 working days arrives between 26 y el 27 de agosto

Color y talla

Color negro

Talla

Secure payment with Stripe · 14 days to return it · 3 years de guarantee

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It is printed in the European Union. It arrives with no customs and no import charges, and without crossing half the world on the way. Plazos medidos contra la imprenta el 19 de agosto de 2026.

The other designs from Jurassic Park / World

2 designs to Jurassic Park / World, on the same sudadera and at the same price.

Ammonites Ammonites Lámina de Hawkins, 1854 Lámina de Hawkins, 1854

Printed on Gildan 18000 de cuello redondo. The last thumbnail is la estampa original de la que sale el diseño.

The garment

Model
Gildan 18000 de cuello redondo
Brand
Gildan
Composition
50 % algodón, 50 % poliéster
Cut
Unisex, cuello redondo —sin capucha ni bolsillo—, corte clásico, tejido prelavado, con cuello de canalé 1×1 con elastano
Printing
Directo a prenda (DTG), tintas al agua
Recommended care
Lavar del revés a 30 °C. Secado a baja temperatura

El blanco puede tirar a hueso en vez de blanco puro, por el tejido.

Data from the Printful spec sheet (Gildan 18000 de cuello redondo), read on 19 de agosto de 2026. The care advice is ours: the manufacturer does not publish the washing label.

Where it comes from: source, motifs and legal status
Source
Paleontología y dinosaurios (ciencia, dominio público)
Motifs
esqueleto de T-rex · lamina científica victoriana · el ámbar con el mosquito · Mary Anning y los primeros fósiles · el amonites · litografía de Hawkins (1854)
Legal status
Public domain. The design is ours; the material it starts from belongs to everyone
The whole collection →

What this sweatshirt is like

It is a Gildan 18000 with a crew neck: no hood, no drawstring, no pocket. It is the classic sweatshirt, the one you put on over a T-shirt and under a coat, and the only one of the three warm layers that gets through an office without looking like something you wear at home. The collar, the cuffs and the waistband are 1×1 rib with elastane, so they go back to shape when you take it off.

Read more about this sudadera

With no kangaroo pocket and no drawstring, the chest is clean from top to bottom. Of all the garments in the catalogue, this is the one where the drawing shows whole, with nothing in front to break it up: if the design has fine detail —a spiral, a seal, a loom—, this is where you can see it without having to blow it up.

Half cotton, half polyester: the blend is what keeps it from losing its shape after a whole winter of washes. Inside out, at 30 °C and dried on low, because strong heat is what shrinks the ribbing. It goes from S to 5XL. In white the fabric leans towards bone rather than pure white; that is the blend, not a printing fault.

«Ammonites» is also on camiseta, 23.95 € · taza, 26.95 € · camiseta premium, 32.95 € · póster, 32.95 € · camiseta de mujer, 33.95 € · sudadera con capucha, 61.95 €

The drawing on «Ammonites»

An ammonite shell coiled on itself: three turns of spiral, the radial ribs crossing it from the inside out, the umbilicus at the centre and the open mouth of the last chamber. A fossil drawn as a fossil, not as spiral decoration.

Where this drawing comes from

What is drawn is a fossil, not a pretty spiral: that is why the umbilicus at the centre and the open mouth of the last chamber are there, which is where the animal came out.

The crew neck has no drawstring and no pocket, so the spiral stays whole and centred with nothing crossing it. It matters more than it sounds: this drawing is built from the navel at its centre outwards, and one drawstring falling over it is enough for the eye to lose the starting point. Here the centre is clean.

The spiral is not traced: it is calculated. It is the logarithmic spiral r = a·k^(θ/2π) with a growth ratio of 2.55 per turn, which is that of the genus Dactylioceras of the Lower Jurassic. Jacob Bernoulli called it «spira mirabilis» in 1692 for precisely that property, and D'Arcy Thompson gives it chapter XI of «On Growth and Form» (1917).

Where this design comes from →

Sizes: measurements, where each one is made and what it costs

Measurements of the garment, not of your body. Take one that fits you the way you like, lay it flat and measure: the width from seam to seam below the sleeve, and the length from the highest point of the shoulder down to the hem. These are the ones the factory itself publishes, in centimetres.

Measurements in centimetres, where it is made and the price of each size
Size LargoAnchoManga Made in Price
S 68,6 50,8 85,1 España 54.95 €
M 71,1 55,9 87,6 España 54.95 €
L 73,7 61 90,2 España 54.95 €
XL 76,2 66 92,7 España 54.95 €
2XL 78,7 71,1 95,2 España 58.95 €
3XL 81,3 76,2 97,8 España 62.95 €
4XL 83,8 81,3 100,3 la UE 66.95 €
5XL 86,4 86,4 102,9 la UE 70.95 €

Manufacturing tolerance: ±2 cm, as with any cotton garment.

Sizes 2XL, 3XL, 4XL, 5XL cost more because they use more fabric and the factory charges us more for them: we would rather say so here and stock them than not have them. The regular sizes all cost the same.

«Made in» comes from the warehouse Printful declares for that exact size, not from an estimate of ours.

What you ask us before buying

Is the spiral traced from a fossil?
It is calculated, not traced: a logarithmic spiral with a growth ratio of 2.55 per whorl, which is the one of the genus Dactylioceras from the Lower Jurassic. And what is drawn is a fossil, with its umbilicus at the centre and the last chamber open, not a decorative spiral with a few stripes added on.
Does it have a hood or a pocket?
Neither of the two: it is a crew neck and the chest is clean. If you are after a hood and a kangaroo pocket, the same design is there on the hoodie, which has a two-layer lined hood with a drawstring and a kangaroo pocket at the front.
Does it shrink or lose its shape?
Not much: it is half cotton and half polyester, and that blend is exactly what takes the washes without going baggy at the cuffs. What does ruin it is a hot dryer, so dry it on low or straight in the air.
How long does it really take?
De 3 a 4 working days, printing and shipping included — the same lead time the rest of the site gives, because there is only one. The piece is made in the European Union, and that is where the lead time comes from. Above, over the button, you have the exact date for this one. The table below says where each size is made.
How much is shipping?
The page itself says so, above the button, before you pay and for whichever destination you pick in the dropdown. To Spain it is 4.29 €. The amount comes from the same rate the checkout charges, not from a separate list.
Why do some sizes cost more?
Because they use more fabric and the factory charges us more. We would rather stock the large sizes and say so in the table than not have them. The regular sizes all cost the same.
Can it be returned?
Yes. You have 14 days to withdraw without giving reasons — it is not a personalised product, so the right of withdrawal covers you — and 3 years of legal guarantee. If it arrives faulty or badly printed, we redo it or give you your money back. How it is made.
Where does the drawing on «Ammonites»?
The spiral is not traced: it is calculated. It is the logarithmic spiral r = a·k^(θ/2π) with a growth ratio of 2.55 per turn, which is that of the genus Dactylioceras of the Lower Jurassic. Jacob Bernoulli called it «spira mirabilis» in 1692 for precisely that property, and D'Arcy Thompson gives it chapter XI of «On Growth and Form» (1917). It is in the public domain: the drawing is ours, the material it starts from belongs to everyone.
Who is selling?
Flexibles y Accesorios Gobe, S.L. · CIF B56727993. Prices include VAT.

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Appears in

Size guide

Measurements of the garment laid flat, in centimetres — not of your body. Tolerance ±2.5 cm. If you are between two sizes and want it roomy, take the bigger one.

MeasurementSMLXL2XL3XL4XL5XL
Largo 68,671,173,776,278,781,383,886,4
Ancho 50,855,9616671,176,281,386,4
Manga 85,187,690,292,795,297,8100,3102,9

How to get it right without trying it on: take a garment of yours of the same kind that fits you the way you like, lay it flat and measure the width from armpit to armpit, and the length from shoulder to hem. Find the closest size in the table. It is more reliable than your usual size, which changes with every brand.

Manufacturer measurements, Gildan 18000 de cuello redondo, synced from their catalogue.

54.95 € Ammonites · sudadera