You can find sideless shirts, often called "extreme cut-out" or "open-side" muscle tanks, at various major retailers and specialty fitness shops. These are popular for bodybuilding, high-intensity workouts, or layered casual wear. Where to Buy Sideless Shirts

: Standard t-shirts with slits running up the sides, often used for a breezy, oversized aesthetic.

: Ideal for finding unique, handmade, or graphic-heavy Open Side Tank Tops that offer a more personalized or festival-ready style.

: Offers affordable options like the Difdany Men's Cut Off Shirts , which feature deep open sides designed specifically for gym workouts and bodybuilding.

: Very thin shoulder straps with completely open sides, common in professional bodybuilding gear.

: A great source for variety, including the Remidoo Women's Open Side Workout Tank Top , which is designed for athletic use and layering over sports bras.

: Features deep armholes that extend down to the waist, providing maximum ventilation.