Built for off-duty agents, early morning training sessions, and the kind of relaxed confidence that never needs to announce itself.

The S.I.S. Stealth Muscle Shirt is soft, lightweight, and cut for effortless movement. Whether you’re training, travelling, walking the coast, stretching out after a workout, or simply taking a well-earned day off, this sleeveless essential delivers comfort with a sharper, more covert edge.

Made from 100% airlume combed ring-spun cotton, it has a premium feel against the skin without looking overdone. The relaxed fit keeps it easy and casual, while the wide, low-cut armholes give it that athletic, urban look worthy of an agent between assignments.

Simple. Clean. Understated.

Exactly how field gear should be.

Details from Q-Branch
• Embroidered S.I.S. Logo in Black
• 100% airlume combed ring-spun cotton
• Soft, lightweight premium feel
• Relaxed fit for easy everyday wear
• Side-seamed construction for a cleaner shape
• Wide, low-cut armholes for comfort and movement
• Ideal for training, lounging, travel, walks, and off-duty operations

For the man who trains quietly, moves confidently, and prefers his gear with a little mystery.

Size guide