What Is the Role of Underarm Gussets in Men's Gym Shirts?

Underarm gussets provide additional shaping and movement allowance near the shoulder joint.

Men's performance garments need fit standards based on the intended body proportions and activity. Chest, shoulder, waist, and movement requirements should be evaluated together; generic size names or a familiar silhouette do not establish whether the garment will remain comfortable during actual training. Confirm their effect through reaching tests.