These are functional period underwear from MUJI. Recommended for sports, active days when you have a heavy flow, or those days when you think, "It's almost here..." I think this product is also perfect for students' club activities and school trips. Thank you. --- Seamless Absorbent Sanitary Shorts XS size Black These sanitary shorts absorb approximately 20ml of liquid in the gusset. They can also be used with a pad (the gusset is double-layered, allowing you to insert the wings of the pad). They are finished with adhesive instead of stitching, so there are no seams, making them less likely to show through your bottoms. Transparency: None Elasticity: Yes ■ How it absorbs Four absorbent pads are attached to the gusset. The absorbent pads are a four-layer structure, from the skin side: ① diffusion fabric, ② absorbent layer, ③ & ④ waterproof fabric.