- Muscle tanks do not get better than this latest incarnation! Garment-dyed cotton jersey is heavily washed to achieve the look and feel of a well-worn-in favorite. Go Softwear's muscle tank is designed with a scoop neck front and Y-back style with roomy armholes to show-off a muscled torso. Contrast stitching completes the look. 100% cotton. Made in U S A.