Underwear fabric is one of those small daily choices that quietly affects comfort, and even hygiene, more than most people realize.
The Case for Cotton
Cotton is breathable and absorbs moisture rather than trapping it against the skin, which many healthcare sources point to as a reason it's often recommended for everyday wear, especially for anyone prone to irritation.
Where Synthetic Fabrics Fit In
Synthetic blends often offer more stretch, smoother lines under clothing, and moisture-wicking properties designed for active wear, which can make them a good choice specifically during exercise.
When to Choose Which
Cotton or a cotton-lined gusset is generally the more comfortable everyday choice for most people, while moisture-wicking synthetics can be worth it specifically for workouts, provided you change out of them promptly afterward.
The Bottom Line
Many people find a mix works best, cotton for daily wear and sleep, moisture-wicking synthetics for the gym. If you experience regular irritation, switching more of your rotation to breathable cotton is a simple first step worth trying.