Thinx feels like normal underwear: washable, reusable, breathable and soft. Only Thinx absorbs your period! I wish I had these for postpartum bleeding! They are made with cotton, nylon and elastane (for stretch) with a top layer that absorbs blood (like a pad would) and dries fast. No pads, tampons, cups needed! Magic. The "air" collection is great for workouts as its micromesh ventilates better than the regular cotton collection. There are different absorbancies. These are level 3/moderate. Absorbancies range from light to super.