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Diamond Theory Clothing

Paradox T-Shirt: Mass

Regular price $78.00 USD
Regular price Sale price $78.00 USD
Sale Sold out
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The T-Shirt

The Diamond Theory Paradox T-Shirt.

A T-Shirt for the Pros.

Made with our signature Muscle Fit which means it is the best fitting T-Shirt in the world for Strongmen.

The Diamond Theory styling cues in the sleeves and embroidery mean that you look a million dollars with sleeves and finishing that are designed to accentuate bis, tris and delts.

What is My Fit?

Diamond Theory has 2 Fits for shirts:

Muscle and Mass

  • Muscle: This fit is designed with Bodybuilders in mind as this has an aggressive taper, bringing it right in at the waist.
  • Mass: This fit is designed with Strongmen in mind as this has a less aggressive taper as Strength Athletes tend to have a thicker core.

Please take this as a reference and refer to the size guide with your measurements.

Size Guide

Check our Size Guide. Select the shirt most accurate to your measurements.

This shirt has been engineered from the ground up specifically for real athletes who carry real muscle and mass. Before you order, please make sure you measure yourself and choose your size according to the size guide. Take your chest measurement and your waist measurement. No need to order a size down for a tighter fit.


This T-Shirt is made from 100% Cotton. The finest cotton we can get our hands one. This means the comfort is unrivalled, the fit is unrivalled and the durability is unrivalled. Put simply, you look and feel like amillion dollars.

Shipping & Returns

Free Shipping
For returns please see returns policy for further detail

Care Instructions

Wash on a low heat, air dry and press. Do NOT tumble dry.

  • Free Shipping over £50