Yes. Period underwear is built to absorb flow directly, no separate product needed. The gusset has a wicking top layer, an absorbent core, and a leak-resistant bottom layer, which means blood travels into the fabric instead of pooling on the surface or leaking through. As long as the absorbency level matches your flow that day, you wear them like regular underwear. On heavier days, some people pair period underwear with a tampon, cup, or disc for extra security. When the pair feels saturated, swap to a fresh one, rinse the used pair in cold water, and follow the care instructions so the absorbent layers keep working.