This is a pack of 40 underarm sweat pads. There are 4 bags, each containing 10 pads. Since there are 40 pads, that's 20 pairs (calculated as one pair per underarm). They are disposable. How about them for the hot summer♪ Product Details ○ Quantity: 40 pads (individually wrapped in packs of 10, antibacterial) ○ Color: White ○ Size: Width 9.5 cm x Length 13 cm, large size ○ Material: Non-woven fabric (polyester/polypropylene) Underarm sweat pads, sweat protection, sweat stain prevention, summer essentials, etiquette, disposable, underarm sweat, deodorization, deodorant spray