The Gymshark Onyx 5 Seamless Hoodie (muscle fit) is a premium training hoodie designed to accentuate your physique while providing a snug, supportive feel. It uses a thick, seamless knit fabric with built-in stretch, giving a compression-like effect without being a true compression garment.

Key features in brief:

* Muscle fit cut – tight around the arms, chest and shoulders to highlight shape
* Seamless construction – smooth finish with minimal irritation and a cleaner look
* Heavy-duty, stretchy fabric – feels supportive and slightly compressive
* Physique-enhancing design – structured to make the upper body appear broader
* Breathable panels/texturing – helps with comfort during workouts or casual wear