Every woman's body is different. That's why o.b.® tampons are designed to help stop leaks by expanding all-around to fit each unique shape. o.b.® tampon’s FLUID-LOCK® grooves pull fluid into the core for locked-in leak protection you can wear for up to 8 hours*. So you can keep your cool and get out there with confidence. Each time you use an o.b.® tampon, you’re adding one less applicator to a landfill or to the ocean. o.b.® tampons are also elemental chlorine-free, use minimal packaging, and 90% of the raw materials used to make them come from renewable resources.