Heartbeat print400 g/m² / 11.8 oz per sq ydHood and kangaroo pocket5 coloursS to XXXL
The essentials: a real ECG trace, not an invented motif: the shape comes from the string galvanometer Willem Einthoven developed from 1901. A boxer walks the flat line, between two beats. The trace runs right across the chest: from three metres / 10 ft you see a line, from one metre you see the fighter. 5 colours, 6 sizes from S to XXXL, European cut — take your usual size. €39, free standard shipping.
The trace on your chest has a name
The line printed here is not an invented decorative squiggle: it is the real shape of an electrocardiogram. Dutch physiologist Willem Einthoven developed his string galvanometer from 1901 onwards and was the first to record the electrical currents of the heart cleanly.
He is also the man who named the five waves P, Q, R, S and T — he reached that far into the alphabet because mathematicians had already claimed the earlier letters. He was awarded the Nobel Prize in Medicine in 1924, and cardiologists still use his lettering today.
The two tall spikes flanking the boxer therefore have a precise name: they are QRS complexes, the contraction of both ventricles. The fighter is stepping through the gap between two beats, at the exact instant the heart pushes the blood out.
The artwork
Single-colour print, centred high on the chest and running edge to edge across the body, with small oscillations to the left and right of the peak. At the centre it rises into a plateau that acts as the floor for a solid boxer silhouette shown in profile: rear leg extended in a forward lunge, torso leaning in, both fists up in guard, no punch thrown. Two tall spikes frame him, one on each side.
No text, no logo, no fighter’s name. Plain back. The trace is printed white on the navy and black bodies, black on heather grey, and yellow or red on the two navy two-tone versions.
The garment
Lined hood with a drawcord, front kangaroo pocket, ribbed cuffs and hem. Straight cut, set-in long sleeves. The ribbing anchors the body of the hoodie so the hood does not pull on your shoulders when you move.
Technical specification
Technical specifications
Our advice: this is the warm-up layer, the one you keep on for skipping and shadow work and pull back on before you leave the gym. Many wear it over a boxing t-shirt so they can strip down without changing.
Your size
European cut — take your usual size. No Asian sizing conversion to apply here, which is what most heat-transfer hoodies sold online require. Six sizes, S to XXXL (XXXL is the same as 3XL), same price across all five colourways. If you plan to wear it over training kit, go one size up.
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Frequently asked questions
What size boxing hoodie should I buy?
European cut — take your usual size, with no conversion to apply. Six sizes run from S to XXXL across all five colourways. If you intend to pull it on over training kit or a second layer, take one size up.
What does the heartbeat boxing design mean?
It is an ECG trace crossing the chest horizontally, its centre rising into a plateau that carries the silhouette of a boxer in guard, caught mid-lunge with both fists up. The fighter is not standing beside the line: the trace is his floor, like the canvas of a ring, and two tall spikes frame him.
What is the QRS complex on an ECG?
It is the tall spike that appears twice on this print, once on each side of the boxer, and it marks the contraction of both ventricles. The five waves were labelled P, Q, R, S and T by Willem Einthoven, who built his string galvanometer from 1901 and took the Nobel Prize in Medicine in 1924. On this print the boxer steps through the flat stretch between two of them.
How do you wash a printed hoodie without ruining the print?
The artwork is applied by heat transfer on PET film, so it holds through the wash. Machine wash at 30 °C / 86 °F inside out, skip the tumble dryer, keep the iron off the print and leave the fabric softener out.
What colours does this hoodie come in?
Five, all in the Colour selector: navy and white, heather grey and black, black and white, navy and yellow and navy and red. Same hoodie, same price throughout.
Can you train in this hoodie?
It is built for the warm-up, for rope work, roadwork and the walk home — the layer you keep on until the first round and put back on afterwards. At 400 g/m² / 11.8 oz per sq yd it holds heat well, which is what you want before you start hitting.
