Take your ride to the next level with the complete X4 MTB protection system—a powerful combination of comfort, flexibility, and confidence. The X4 MTB Short Sleeve Shirt features G-Form’s re-engineered SmartFlex® technology, now reshaped and pre-curved for ergonomic, body-hugging protection at the shoulders and ribs. Its slim-fit, breathable compression mesh delivers a natural feel and all-day comfort, while the inner hem gripper keeps everything securely in place through every climb, drop, and descent.

Paired with the X4 MTB Short Liners, you’ll experience the same SmartFlex® innovation—strategically placed for protection without restricting movement. The compression-fit base layer includes breathable 4-way stretch mesh, dual pockets, a double-layer design for added coverage, and an integrated chamois for long-ride comfort. Interior leg grippers ensure a stay-put fit, no matter how rough the trail gets.

Save 10% when you buy both as a bundle—the ultimate setup for riders who demand advanced protection, superior comfort, and confidence to push beyond limits.

Please reference our sizing & fit guides here