Diamond Theory

Diamond Theory is a British Company based in the North-West of England. We started our journey in 2019 with one simple aim, to produce the best clothing in the world for Muscle and Strength Athletes.

We spent years studying muscle shapes, body contour and movement to develop garments that accommodate real muscle and mass, whilst using the best fabrics. Finally we launched at the 2021 Arnold Sports Festival. 

We have our shirts on the best athletes around the world, literally the World's Strongest Men, which is in line with our vision, to be the best for the best.

The struggle goes beyond training, eating and sleeping, this is a way of life. It is something that chose you, so everyday you have to make the best of it, no matter what demons you're facing. 

Everything you do is to excess, everything you eat is excessive, the way you train is excessive, your discipline is excessive, your size is excessive, there is nothing about you that hasn't been pushed to the nth degree - the obsession is excessive. And this is what forms the core of our company values.

We obsess over every minor detail and every measurement. There is nothing in our garments that hasn't been considered then reconsidered, tested then retested, everything is done to excess.

For example, there are 9 measurements in the sleeve alone. Why? To make sure it fits, flows and looks right. This is a sport where nothing is left to chance. If you're going up on that stage, you better know that you have everything in order. And this is why we can confidently say we are the best at what we do.

Feel free to ask us any questions, please get in touch via email or through the chat function.

Remember: These are garments that have been developed from scratch, purely for real athletes. Everyone you see on this website it competing in some way, whether that's on the bodybuilding stage or in the strength arena. If this isn't you, then we're not your brand.