A bench shirt is a tight, thick garment worn by powerlifters to increase the amount of weight they can bench press. It works like a heavy-duty slingshot: the shirt’s stiff fabric stretches as you lower the bar to your chest, stores that energy, and snaps back to help you push the bar upward. On average, a single-ply bench shirt adds about 22% to a lifter’s max bench press, which can translate to 50 or more extra kilograms depending on the lifter’s strength level.
How a Bench Shirt Works
The concept is straightforward if you’ve ever stretched a thick rubber band. As you lower the barbell during a bench press, the tight fabric across your chest and arms deforms. That deformation stores elastic potential energy, the same kind of energy stored in a compressed spring. Once the bar touches your chest and you begin pushing upward, the shirt releases that stored energy and helps drive the bar back to lockout.
This means the shirt provides the most assistance at the bottom of the lift, where the bar is closest to your chest and the fabric is most stretched. As you press higher and the shirt returns closer to its resting shape, the assistance fades. Lifters still need tremendous raw strength to lock out heavy weights, but the shirt effectively eliminates the weakest point of the movement as a limiting factor.
Origins in Powerlifting
Powerlifter John Inzer began marketing an innovative bench press shirt design in 1973, and by February 1980, the first advertisement for a bench press shirt appeared in Powerlifting USA magazine. The original shirts were designed partly for shoulder protection, but lifters quickly realized the performance benefit of the tight, elastic fabric. Over the following decades, shirt designs grew progressively stiffer and more supportive, eventually splitting the sport into “raw” (no shirt) and “equipped” divisions.
Polyester vs. Denim Shirts
The two main bench shirt materials are polyester and denim, and each handles differently on the lifter’s body. Polyester shirts tend to provide more carryover, meaning a bigger gap between your raw max and what you can lift in the shirt. One experienced lifter reported being able to touch the bar to his chest with 275 pounds in a denim shirt but needing 315 to 335 pounds just to get the bar down in a comparable polyester shirt. That extra resistance means more stored energy and more help on the way up.
The tradeoff is that polyester stretches out faster with repeated use, though lifters can restore some tightness by boiling the shirt. Denim shirts are more durable and break in gradually, but some lifters find they torque the shoulders more aggressively. Shoulder-friendly positioning matters with any shirt, but poly tends to be more forgiving for lifters who don’t press with a wide, arched style.
How Much Weight Does a Shirt Add?
A survey of competitive equipped lifters found that single-ply bench shirts produced an average improvement of about 54 kilograms (roughly 119 pounds) over their raw max. In percentage terms, that averaged 22%, though individual results ranged from around 18% to 26% once statistical outliers were removed. A lifter with a 400-pound raw bench might expect to press somewhere around 480 to 500 pounds in a well-fitted single-ply shirt.
Multi-ply shirts, which use two or more layers of fabric, can push those numbers even higher. The added layers create more resistance and store more energy, but they also make the shirt harder to control and significantly more difficult to get on.
Putting On a Bench Shirt
Getting into a bench shirt is a process that usually requires at least one helper and sometimes two or three. The shirts are intentionally sized much smaller than your body, so pulling them on is a physical effort in itself. Lifters typically start by sliding plastic bags or specialized “shirt slippers” over their arms just above the elbow so the stiff fabric can slide over the skin without catching.
From there, the shirt gets scrunched up and worked onto both arms simultaneously, with the back pulled over the neck as a leverage point. Helpers push and shimmy the sleeves into position. For an especially tight fit, lifters pin excess shoulder material against a barbell’s knurled surface and push their arms deeper into the sleeves. The smooth section of the bar is used near the armpits to avoid tearing the fabric. The bottom of the shirt can be folded under the bar while leaning back to pull the collar down into its final position. The whole process can take several minutes and leaves red marks and bruises on the skin.
Who Uses Bench Shirts
Bench shirts are used exclusively in equipped powerlifting competitions. Most powerlifting federations offer both raw and equipped divisions, with clear rules about what type and how many plies of shirt are allowed. In raw divisions, bench shirts are banned entirely. Some federations permit single-ply only, while others allow multi-ply gear.
Because of the skill required to use a bench shirt effectively, most recreational lifters and beginners train without one. Learning to press in a shirt is essentially learning a different movement pattern: the bar path, touch point on the chest, and timing all change compared to a raw bench press. Equipped lifters typically spend months learning to use a new shirt before competing in it, often working with training partners who understand how to adjust the fit between sets.