What is the best fabric for a sports bra?

A good sports bra fabric needs to offer support, stretch recovery, breathability, and comfort against sensitive skin. Organic cotton-elastane blends are ideal for low-to-medium impact activities because they are soft, breathable, and unlikely to cause irritation. For higher-impact workouts, merino wool blends provide excellent moisture management and stay fresher longer between washes.

Avoid sports bras made entirely from polyester or nylon, as these fabrics trap heat and odor in one of the sweatiest areas of the body. Many people experience rashes, acne, and irritation on their chest and underbust from synthetic sports bras — switching to natural fibers often resolves these issues.

ONDU features sports bras from brands like Organic Basics and Boody that combine natural fibers with enough elastane to deliver real support without compromising on skin health.